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Thread: Makita 18V LXT batteries....

  1. #1
    Flashaholic
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    Default Makita 18V LXT batteries....

    I have a few Makita 18V LXT Li-Ion cordless power tools. Recently, one of my battery packs wouldn't take a charge using the default charger. Since the battery is out of warranty anyway, I plan to take the battery apart to have a look when I get the time. Does anyone here know what type of cells Makita uses to build these packs? I saw a video on YouTube of someone taking one apart and know that there are 10 cylindrical cells in a 5S, 2P configuration. If the fault is the result of one or two dead cells, would it be as simple as replacing those cells? The thing I'm most unsure about is whether or not the charger will reject the new cell(s) inside the pack since Makita claims that the charger communicates with the pack when charging.

    On a different note, my cheapo no-brand multimeter just died on me and I'm looking for a replacement for it. I want to step up to a Fluke but find myself inundated with different model choices. I don't mind spending more for extra features so as to be sure I won't need upgrade if/when I decide to get more involved in electronics. I would appreciate any recommendations.

  2. #2
    Flashaholic* Alan B's Avatar
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    Default Re: Makita 18V LXT batteries....

    Makita reportedly uses Sony Konion LiMn cells. Generally it is the first pair. There are 10each 18650 cells in 5S2P.

    Replacing the first two cells is possible, and has been done. I found a video about it on Utube. Not a lot of detail on replacement but lots of info about taking the pack apart.

    The problem is the battery memory chip tells the charger the pack was bad. Once that happens it is not clear how to get it to try charging again. You could charge with some other charger. But if the memory on the battery tells the Makita charger the pack was bad it apparently won't try to charge it any more.

    I have not verified this but there is lots of info on some of the eBike forums on these batteries.

  3. #3
    Flashaholic* abarth_1200's Avatar
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    Default Re: Makita 18V LXT batteries....

    I have found a few 'dead' makita 18V LXT batteries on ebay for cheap, is it maybe worth while getting one and bump starting it, with a higher voltage.

    I have succesfully done this with one of my AW cells that went dead and read zero on my volt meter, I just zapped it with a 9V battery and its fine now, holds its charge well and takes the usuall time to recharge.
    'It's only when you look at an ant through a magnifying glass on a sunny day that you realise how often they burst into flames'

  4. #4
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    Default Re: Makita 18V LXT batteries....

    I have successfully repaired a Makita LXT 3 AH pack by replacing the dead cells with good cells from a donor pack. The battery memory chip prevents the pack from being charged from a Makita charger but you can use a charger that terminates at 21vdc. I took my repaired pack to Makita's headquarters in La Mirada, CA. They had no way to reset it and offered no other advice.
    Photon,ARC-P, Tikka XP (4-2/3 AAA) Mod ,Bright Star 3 cell (dual use '4 led' and 20w ESX Halogen overdriven at 14.4v) , Ryobi 18v driving a 12v 50W Halogen, Sun Gun II 650W of Daylight (Lights 2x4's on fire).

    Ecc 11:7 Truly the light is sweet, and a pleasant thing it is for the eyes to behold the sun:

  5. #5

    Default Re: Makita 18V LXT batteries....

    This thread is exactly why I signed up for this forum! Awesome!

    Now, has anyone figured out how to "fix" or replace the memory chip so that you can replace the cells and then reuse the battery in the charger?

    Also, is there a way that any of us knows about to remove any memory restrictions?

    I ask because my father used the fully charged batteries for about 5-10 minutes each then threw them back on the charger. Now they only hold a charge for 5-10 minutes of power which sux. I'd rather not have to replace them. If I could just hack the chip and reset the memory values, that'd be best/easiest.

  6. #6
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    Default Re: Makita 18V LXT batteries....

    I did a lot of research on the net about early failure of Makita lithium batteries. My conclusion: this
    battery has design flaw that shuts down these batteries prematurely.  If the battery sits discharged for a long
    time, it's very likely to spuriously fail.&nbsp; The symptom is flashing red and green lights on the charger, for a battery with infrequent use.&nbsp; [This is not the same as an actual worn out battery that is several years old and has many charges on it, say 500 charges or more.&nbsp; That is normal wearout, not the premature failure I mentioned.&nbsp; See below for some ways to fix a worn out battery.]<br><br>The good news is Makita will replace the battery free if it has a low charge count (for sure under 150, some say under 300), regardless of warranty.&nbsp; The bad news is you lose time and money dealing with it, and a lot of people don't know about the free replacements. Makita should recall the batteries, but they are quietly ignoring the problem.&nbsp; Most people just buy a new battery, so Makita has a conflict of interest here.&nbsp; Most of my power tools are Makita, and they usually last for years, top quality.&nbsp;&nbsp; I'm very surprised at the way Makita is (not) dealing with this lemon.<br><br>Background: Lithium batteries
    can burn or explode if abused. They need monitoring, for safety reasons.
    So Makita put in a smart control board in the battery
    pack. The control board monitors charging voltage, current, battery
    temperature, number of charges, and remembers all that. Good idea,
    right? But.. there is a design bug. The battery control board draws
    power only from the first cell of the 5 cells in the battery. If you
    leave it sitting for a while, the control board will deep discharge that
    first cell to zero, while the others remain charged. To the control
    board or possibly the charger, that looks like a shorted cell, which
    could overheat, and the control board remembers it.&nbsp; If you try to charge
    it more than 3 times with an apparently deep discharged cell, the conservative software in the control board locks the battery permanently! The
    control board tells the Makita charger that the battery is unsafe to charge,
    and prevents charging in the Makita charger.&nbsp; Once "bricked", the battery cannot be reset.<br><br>This is a design bug.&nbsp; The
    key evidence is the apparent dead cell is almost always that first cell, the
    one that powers the control board.&nbsp; Once locked, the control board can't be reset.&nbsp; This problem is so common that Makita Service Centers will replace your dead battery if it shows very low usage, under 150 charges, regardless of warranty status.&nbsp; So, they know about the problem, but have not recalled the battery officially.&nbsp; They let you buy a new battery instead!&nbsp; That's not right. &nbsp; We should not have to deal with premature failures
    caused by a known design defect.&nbsp; Who has time on the job, and who has
    money to throw away?<br>
    <br>If you have a locked battery with low use, contact the Makita Service Center near you for a replacement.&nbsp; If they won't replace it, it may still be usable.&nbsp; The workaround is to charge it on third party chargers, that ignore
    the control board. Aftermarket chargers cost about $60 on eBay, a lot less than a new battery.&nbsp; They take longer to charge the battery, 2 hours instead of 20 minutes for the Makita charger.&nbsp; No free lunch, but at least you can save your perfectly usable battery from landfill.<br><br>I can think of many engineering changes to fix this. For
    example, Makita could reprogram the battery control board or charger so
    it did not lock up a good battery, or the control board could draw power
    from all 5 cells so this is less likely to happen to a single cell, or
    use a separate coin cell for the control board, or ... well, as you can
    see there are many technical options.&nbsp; My point is that
    Makita's engineers need to pick a solution and fix this problem.<br><br>This serious
    problem has been identified, and it needs to be fixed. In my opinion,
    Makita should recall these batteries and fix this problem, and release a revised battery design for new sales. If not, Makita's reputation will
    continue to suffer, and there could be a class action lawsuit too.
    Makita is infuriating customers and harming its reputation. <br>________________<br><br>Worn out lithium batteries:&nbsp; If your batteries are many years old and have had a lot of use or been subjected to high heat, they could simply be worn out.&nbsp; That's a different problem.&nbsp; Lithium cells do wear out, and they also permanently lose capacity each year - about 20% per year, faster if stored hot.&nbsp; Makita knows this and they derated these batteries to allow for shelf life.&nbsp; The cells are actually good for 2400 Mah when new, but Makita rates them as 1500 Mah to be conservative.&nbsp; <br><br>You can repair these batteries by replacing cells, either some or all.&nbsp; Watch this youtube video on how to open the battery pack:&nbsp; <br><br>http://www.youtube.com/watch?v=Z5taguEdlkY<br><br>The cells are Sony 18650 size in 2400 mah capacity.&nbsp; These are not sold retail, only to manufacturers and repair centers.&nbsp; You have to get them from another Makita pack, or many laptop batteries use them.&nbsp; There are 5 in the 1815 battery, 10 in the 1830 battery.&nbsp; If the failure is just in the first cell, I'd take it to Makita for possible replacement.&nbsp; <br><br>You may be able to trickle charge a cell and bring the pack back to life.&nbsp; The Tenergy Combo charger is a safe charger for this:<br>http://www.amazon.com/Combo-Special-Tenergy-Balance-Charger/dp/B00466PKE0<br><br>If more cells are bad, measure the voltage on each cell or cell pair,
    and replace as needed.&nbsp; If you have more than half bad, replace them
    all, becasue the rest will go soon.&nbsp; If you replace them all, they don't
    have to be Sony, just any quality cell, 18650 size 2400 mah or better,
    from a good maker.&nbsp; You can find them on ebay.<br><br>Here is a website that deals with repairing an older NiCd pack.&nbsp; The cells are different but the procedure is similar.&nbsp; Good photos step by step:<br>http://www.kichline.com/chuck/fixit/makita/Default.htm<br><br><br>&nbsp;

  7. #7
    Unenlightened
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    Default Re: Makita 18V LXT batteries....

    I've been researching the Makita batteries for someone who tried to fix it himself. I saw your post and wanted to thank you for the information. Can Toolmon contact me directly for more detailed questions?

  8. #8

    Thumbs up Re: Makita 18V LXT batteries....

    Quote Originally Posted by Toolmon View Post
    I did a lot of research on the net about early failure of Makita lithium batteries. My conclusion: this
    battery has design flaw that shuts down these batteries prematurely.&nbsp; If the battery sits discharged for a long
    time, it's very likely to spuriously fail.&nbsp; The symptom is flashing red and green lights on the charger, for a battery with infrequent use.&nbsp; [This is not the same as an actual worn out battery that is several years old and has many charges on it, say 500 charges or more.&nbsp; That is normal wearout, not the premature failure I mentioned.&nbsp; See below for some ways to fix a worn out battery.]<br><br>The good news is Makita will replace the battery free if it has a low charge count (for sure under 150, some say under 300), regardless of warranty.&nbsp; The bad news is you lose time and money dealing with it, and a lot of people don't know about the free replacements. Makita should recall the batteries, but they are quietly ignoring the problem.&nbsp; Most people just buy a new battery, so Makita has a conflict of interest here.&nbsp; Most of my power tools are Makita, and they usually last for years, top quality.&nbsp;&nbsp; I'm very surprised at the way Makita is (not) dealing with this lemon.<br><br>Background: Lithium batteries
    can burn or explode if abused. They need monitoring, for safety reasons.
    So Makita put in a smart control board in the battery
    pack. The control board monitors charging voltage, current, battery
    temperature, number of charges, and remembers all that. Good idea,
    right? But.. there is a design bug. The battery control board draws
    power only from the first cell of the 5 cells in the battery. If you
    leave it sitting for a while, the control board will deep discharge that
    first cell to zero, while the others remain charged. To the control
    board or possibly the charger, that looks like a shorted cell, which
    could overheat, and the control board remembers it.&nbsp; If you try to charge
    it more than 3 times with an apparently deep discharged cell, the conservative software in the control board locks the battery permanently! The
    control board tells the Makita charger that the battery is unsafe to charge,
    and prevents charging in the Makita charger.&nbsp; Once "bricked", the battery cannot be reset.<br><br>This is a design bug.&nbsp; The
    key evidence is the apparent dead cell is almost always that first cell, the
    one that powers the control board.&nbsp; Once locked, the control board can't be reset.&nbsp; This problem is so common that Makita Service Centers will replace your dead battery if it shows very low usage, under 150 charges, regardless of warranty status.&nbsp; So, they know about the problem, but have not recalled the battery officially.&nbsp; They let you buy a new battery instead!&nbsp; That's not right. &nbsp; We should not have to deal with premature failures
    caused by a known design defect.&nbsp; Who has time on the job, and who has
    money to throw away?<br>
    <br>If you have a locked battery with low use, contact the Makita Service Center near you for a replacement.&nbsp; If they won't replace it, it may still be usable.&nbsp; The workaround is to charge it on third party chargers, that ignore
    the control board. Aftermarket chargers cost about $60 on eBay, a lot less than a new battery.&nbsp; They take longer to charge the battery, 2 hours instead of 20 minutes for the Makita charger.&nbsp; No free lunch, but at least you can save your perfectly usable battery from landfill.<br><br>I can think of many engineering changes to fix this. For
    example, Makita could reprogram the battery control board or charger so
    it did not lock up a good battery, or the control board could draw power
    from all 5 cells so this is less likely to happen to a single cell, or
    use a separate coin cell for the control board, or ... well, as you can
    see there are many technical options.&nbsp; My point is that
    Makita's engineers need to pick a solution and fix this problem.<br><br>This serious
    problem has been identified, and it needs to be fixed. In my opinion,
    Makita should recall these batteries and fix this problem, and release a revised battery design for new sales. If not, Makita's reputation will
    continue to suffer, and there could be a class action lawsuit too.
    Makita is infuriating customers and harming its reputation. <br>________________<br><br>Worn out lithium batteries:&nbsp; If your batteries are many years old and have had a lot of use or been subjected to high heat, they could simply be worn out.&nbsp; That's a different problem.&nbsp; Lithium cells do wear out, and they also permanently lose capacity each year - about 20% per year, faster if stored hot.&nbsp; Makita knows this and they derated these batteries to allow for shelf life.&nbsp; The cells are actually good for 2400 Mah when new, but Makita rates them as 1500 Mah to be conservative.&nbsp; <br><br>You can repair these batteries by replacing cells, either some or all.&nbsp; Watch this youtube video on how to open the battery pack:&nbsp; <br><br>http://www.youtube.com/watch?v=Z5taguEdlkY<br><br>The cells are Sony 18650 size in 2400 mah capacity.&nbsp; These are not sold retail, only to manufacturers and repair centers.&nbsp; You have to get them from another Makita pack, or many laptop batteries use them.&nbsp; There are 5 in the 1815 battery, 10 in the 1830 battery.&nbsp; If the failure is just in the first cell, I'd take it to Makita for possible replacement.&nbsp; <br><br>You may be able to trickle charge a cell and bring the pack back to life.&nbsp; The Tenergy Combo charger is a safe charger for this:<br>http://www.amazon.com/Combo-Special-Tenergy-Balance-Charger/dp/B00466PKE0<br><br>If more cells are bad, measure the voltage on each cell or cell pair,
    and replace as needed.&nbsp; If you have more than half bad, replace them
    all, becasue the rest will go soon.&nbsp; If you replace them all, they don't
    have to be Sony, just any quality cell, 18650 size 2400 mah or better,
    from a good maker.&nbsp; You can find them on ebay.<br><br>Here is a website that deals with repairing an older NiCd pack.&nbsp; The cells are different but the procedure is similar.&nbsp; Good photos step by step:<br>http://www.kichline.com/chuck/fixit/makita/Default.htm<br><br><br>&nbsp;
    Success! Thanks for the info. I was able successfully replace 2 of the defective cells from an original Makita BL1830 lithium battery. The trick is to replace as soon as the charger report an red-and-green warning light. If you tried to charge the defective battery for more than 3 times, it bricks the battery permanently and the only 2 ways now to fix that is to use a 3rd party Li-Ion charger or swap out the circuit board.

  9. #9
    Flashaholic*
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    Default Re: Makita 18V LXT batteries....

    Does anyone know if there has been a lawsuit yet?

    This has been a very informative thread. Thanks to all who posted.
    "We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light." Plato

  10. #10

    Default Re: Makita 18V LXT batteries....

    Could someone post a link to an aftermarket charger that will charge a bricked battery, please? Google doesn't seem to know about them.

    Is there some way to get the Makita charger to ignore the chip in the battery pack? A switch to turn off that check would probably be cheaper than a second charger.

  11. #11
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    Default Re: Makita 18V LXT batteries....

    Yes, there is pending investigation for a class action lawsuit. I would be interested to know if I can get direct contact information from anyone interested in recovering their losses on the battery. The more consumers who have evidence, the better likelihood of success on the case. If the moderator will allow it, I will be happy to post the status of the lawsuit and try to get those compensated who have a defective battery. I would need to have direct contact between me and the consumers.

    Quote Originally Posted by jbrett14 View Post
    Does anyone know if there has been a lawsuit yet?

    This has been a very informative thread. Thanks to all who posted.

  12. #12
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    Default Re: Makita 18V LXT batteries....

    For anyone interested, I had the internal pc board brick 3 of my LXT batteries. The interesting part is the cells aren't bad. No need to replace any of them. The problem is they won't charge in the factory charger ever again. To my understanding if you try to charge with the makita charger 3 times the battery will never charge in the makita charger again. These batteries take a charge and hold a charge and are usable. They just won't charge because of the internal chip. For future reference if anybody has a dead battery, take a good battery and use jumpers from the good battery to the bad one and they will take a charge. I just use a couple of 10mm or (1/4" if they aren't 2 thick) washers slipped in the clips and alligator clips to jump. It takes only about 5 minutes to recharge them like this. They will read 17+ volts that quick and will charge in the factory charger then.

    PS Anybody have more information on a potential class action suit. I'm sitting here looking at 23 dead makita batteries (only 3 are the lxt, 12 Nimh, 8 Nicd just sat too long there is the same type of issue where the charger won't charge whether there are dead cells or not) and the fact that I have 3 good batteries that won't charge due to this design flaw on the LXT and lack of any kind of support or help from makita is intolerable.

  13. #13
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    Default Re: Makita 18V LXT batteries....

    Hi everyone,
    I come across this thread via a google search.
    I am a tradie who abuses the crap out of the LXT batteries, in 5 years I have had 2 fail. I have also collected a few 1830 packs that are buggered also.

    I am quite competent when it comes to sussin' out faults, and I can report on all my failed packs it is always the first parelleled pair that goes. Some times they even seem to be reverse polarity!

    I have loaded up a genuine makita pack with a "bricked chip" with new cells as required, but no deal, the charger ( blue fast charger ? ) rejects it instantly and on monitoring the current passed to the battery from the charger shows absolutely nothing.

    Interestingly, there are a bunch of knock off cheap chinese packs on ebay for about $60, more for curiosity than anything I bought 1, it failed within about 2 months after reasonably heavy use, the same fault, the first 2 cells are basically a bit of wire.
    I popped 2 new cells in and tried to charge, but after about 15 seconds the charger rejects it. Before the charger gives it the boot, it does actually take on a charge. The pack as a whole is still only about 16v, so very flat. I think the charger is rejecting based on an unbalanced situation, as the new cells at 3,8v the others much less.

    It doesnt seem to matter how many times I put on the knock off pack, it always seems to charge for a bit then carck it, the real deal does not take a charge at all.

    I might jump the dead pack with a good full one, and see if i can get the volts high enough for the charger to take it.

    Would be nice if some brainiac works out how to render the smart chip not so smart. In the mean time there is the universal route!

  14. #14
    Flashaholic* Lurveleven's Avatar
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    Default Re: Makita 18V LXT batteries....

    If you had a RC-charger, then you could try to charge and balance the cells before assembling the pack back together.

  15. #15

    Default Re: Makita 18V LXT batteries....

    i have 3 such drils at work, all still going strong, and are used almost daily. i have taken them apart, just to see how they are made. despite having multicontact plug, in addition to +,-, temp. the cells are not ballanced, in factory charger. the last sell, has wire soldered to negative and to the pcb. the cells are of that chemistry that alows overcharging, so the pcb basicly monitiors soc of the last cell, overcharging the rest in proccess. it is entirely possible to make a charging\ballanced plug\tail, and charge those in hobby charger, it wil be slower however.
    even thou i have 3 li ion makitas at work, i still prefer nicd milwaukee drill.

  16. #16

    Smile Re: Makita 18V LXT batteries....

    Hi fella's,

    I have had my Makita lxt600 combi kit for about 4 months and have found that the batteries were letting me down. I have read the posts below and i can say that i think taking the batteries apart etc is way too technical for me. I am happy using the tools etc but taking them apart i`d rather take them to a shop and get them replaced. This leading me to my point, when i bought my combi kit from SCR*WF/X i had 2 batteries go down within 2 weeks. So i went back with my receipt and the complete kit in the same box as purchased and when i asked for a replacement under the warranty, i was blatantly denied. To simply put it, i was told "NO, You have to deal with Makita for that". So i spoke to a few lads on site and was told that they should replace them for me free of charge. I went to another tool store local to me A One Tools & Fixings Brighouse, and was absolutely amazed when i asked if they could help me with any advise and they told me to bring the batteries in for them to look at and if they were deemed faulty, that they would swap the batteries out for me with brand new ones under the warranty claim. This to me was the biggest blessing about buying this kit, aonetools helped me out so much regarding this and i`m just wondering if anyone else had has this scenario where they were blatantly told to go away but then found that another company would help them with there warranty claims??

  17. #17
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    Default Re: Makita 18V LXT batteries....

    So can you balance the Makita 1830 batteries with an RC Charger?

  18. #18

    Default Re: Makita 18V LXT batteries....

    Quote Originally Posted by nichol View Post
    So can you balance the Makita 1830 batteries with an RC Charger?
    theoreticly yes, but why???

    all cells charge fully with factory charger, even thou most get overcharged in the process, but cells chemistry allows it somewhat. and you would have to take apart the pack, and solder balance tail to it. and at the end, you will, most liklely, not get any improvment, over factory set up. not to mention good bye warranty

  19. #19
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    Default Re: Makita 18V LXT batteries....

    Quote Originally Posted by alpg88 View Post
    all cells charge fully with factory charger, even thou most get overcharged in the process, but cells chemistry allows it somewhat. and you would have to take apart the pack, and solder balance tail to it. and at the end, you will, most liklely, not get any improvment, over factory set up. not to mention good bye warranty

    I would think all LiIon tool batteries that are more than 4v would balance automatically as part of the charge circuitry. You don't want to overcharge LiIon and over time they can become un-matched and really be nasty in a tool (high current) environment.

  20. #20

    Default Re: Makita 18V LXT batteries....

    Quote Originally Posted by itguy07 View Post
    I would think all LiIon tool batteries that are more than 4v would balance automatically as part of the charge circuitry. You don't want to overcharge LiIon and over time they can become un-matched and really be nasty in a tool (high current) environment.
    thoses are not regular li co cells, (in factroy batteries), those cells can take overchrge, and are made for high current, and no, li ion cells do not balance automaticly, in those batteries, since there is no balance circuit. just monitoring of last cell in the pack. take one apart you'll see what i'm talking about.
    i have few li ion drils at work that are used almost daily, we had no problems so far with batteries, all still work fine.

  21. #21
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    Default Re: Makita 18V LXT batteries....

    Quote Originally Posted by alpg88 View Post
    thoses are not regular li co cells, (in factroy batteries), those cells can take overchrge, and are made for high current, and no, li ion cells do not balance automaticly, in those batteries, since there is no balance circuit. just monitoring of last cell in the pack. take one apart you'll see what i'm talking about.
    i have few li ion drils at work that are used almost daily, we had no problems so far with batteries, all still work fine.
    Then Makita is selling some junky LiIons. Even the lowly Ryobis have a cell balancer built in. Look at this page:
    http://toolboyworld.com/eBay/Ryobi_Batt_Rebuild.htm

    Lots of circuitry and you can see that there are connections to the motherboard from each cell.

    Also Miwaukee states they have balance circuitry in their batteries:
    http://www.milwaukeetool.com/lithium-ion
    http://www.facilitiesnet.com/equipme...Battery--3001#

    Good LiIon tool batteries need to have balancing built in, either in the battery or the charger.

  22. #22

    Default Re: Makita 18V LXT batteries....

    i beg to differ, makitas work just fine, that i see firsthand, for years, how they do it, makes no difference to me. they use sony cells btw.

    Good li ions are those that work good, and makita does just that, if they can acheave it with simpler circuit, good for them, not a negative point by any means, ime.

  23. #23
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    Default Re: Makita 18V LXT batteries....

    deleted
    missed "reply with quote" - post made no sense without ti..
    Last edited by Chodes; 06-14-2013 at 06:03 PM.

  24. #24
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    Default Re: Makita 18V LXT batteries....

    Quote Originally Posted by alpg88 View Post
    theoreticly yes, but why???

    all cells charge fully with factory charger, even thou most get overcharged in the process, but cells chemistry allows it somewhat. and you would have to take apart the pack, and solder balance tail to it. and at the end, you will, most liklely, not get any improvment, over factory set up. not to mention good bye warranty
    I believe Lurveleven suggestion was for Therapyo to balance charge the pack he was unable to chage with makita charger due to first 2 cells (same problem with his knockoff pack).
    He had pack apart, so hope was to balance charge to restore pack then continue to use with Makita charger.

  25. #25
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    Default Re: Makita 18V LXT batteries....

    Does this problem still exist with the newer 18volt XLT batteries and
    the DC18RA charger?
    Thanks Dave

  26. #26

    Default Re: Makita 18V LXT batteries....

    Quote Originally Posted by dwminer View Post
    Does this problem still exist with the newer 18volt XLT batteries and
    the DC18RA charger?
    Thanks Dave
    i,m not aware of any changes made to makita batteries or chargers lately, neither i'm aware of any problems they have, i have few of them at work that are used daily, no problems with either.

  27. #27

    Default Re: Makita 18V LXT batteries....

    On a related note, had a similar issue with a Lenovo laptop battery pack. The laptop was broken and one of the internal cell connections for the balancing, not the power connection, came off. No worries thought I, just a little bit of solder and we are good to go. Unfortunately, the battery management chip bricked the battery pack and there was nothing that could be done about it. Went on the web and found numerous complaints about situations where the pack just bricked even though it still had a lot of capacity and nothing could be done about it.

    Bad corporate citizenship at the end of the day .... along the lines of bricking printer cartridges but I would say in this case even worse as battery packs are likely a small replacement market overall.

    Semiman

  28. #28
    Unenlightened
    Join Date
    Aug 2013
    Posts
    1

    Default Re: Makita 18V LXT batteries....

    Can someone speak to whether you can replace your battery, if defective, regardless of warranty, like someone above mentioned? I called Makita and they weren't having that.

  29. #29

    Default Re: Makita 18V LXT batteries....

    I have started reverse engineering on the Makita LiIon battery pack. So far it's clear, that the communication between the MCU and charger is done by UART on MCU (MCU connects to battery management chip via I2C). There will be plenty of thing to find out until the hacking of the locked chip will be possible. In addition, there's also EEPROM in the battery management chip, which may also contains some "lock".

    In next days I'll first try to replace battery managment chip between locked and unlocked battery to see, if the issue is in MCU's eeprom or in battery management chip. (first option is more possible) I'll also try to "sniff" on the data lines to see, what messages are exchanged between the battery and the charger. Lots to doo, so if any has some more information on the protocol itself, I'd be glad to know it ...

    Follow this for more details: http://www.ecat.si/2013/09/makita-ha...art-i/?lang=en

    Regards,
    Gregor

  30. #30

    Default Re: Makita 18V LXT batteries....

    Hi Guys,
    This thread is great! Glad I found it!
    I have an 1830 battery that is giving the red/green flash from the factory charger. I know this sequence has happened at least twice. Hopefully the control board isn't already bricked. I opened up my pack and found one cell showing 0 volts. I have tried to charge just that cell with my Accucell 6 charger but it won't take a charge. So, that means I am down to replacing the cell. I have read above that these packs actually use Sony LiMn instead of the usual LiPo 18650s. I have lots of 18650s but none are LiMn. I am concerned that it isn't safe to mix the two types in the same pack. So far, I haven't found any info to that idea on google. Do you guys know if I can drop a LiPo into the mix with the LiMn cells?
    Thanks!
    John

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