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Thread: Best way to maintenence Eneloops?

  1. #31

    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by bob_ninja View Post
    Fridge is not applicable. LSDs are designed to hold charge for a long time at normal temps. Therefore there is no need for fridge, etc. You simply store them any place at normal temps, any place not exposed to direct sun light would be fine.
    I know fridge is not applicable, however, since it is a NiMH battery, storing it in the fridge helps lower it's discharge rate by 5% or something.

    Most people cant be bothered to do so as the rate that the fridge helps it is too low.

  2. #32

    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by kay188 View Post
    I know fridge is not applicable, however, since it is a NiMH battery, storing it in the fridge helps lower it's discharge rate by 5% or something.

    Most people cant be bothered to do so as the rate that the fridge helps it is too low.
    Somewhere, out in Internet land, is a R/C electric flier who did tests on the Eneloops when they first came to market. His review prompted some a response, and clarification of certain points, from Sanyo Europe. One of those was the slowdown of self-discharge by lowering the storage temperature. Basically, yes, the fridge is good for Eneloops, but it depends on how long you're going to store them and what the ambient temp would have been had you not stuck 'em in the fridge.

  3. #33
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    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by clintb View Post
    Somewhere, out in Internet land, is a R/C electric flier who did tests on the Eneloops when they first came to market. His review prompted some a response, and clarification of certain points, from Sanyo Europe. One of those was the slowdown of self-discharge by lowering the storage temperature. Basically, yes, the fridge is good for Eneloops, but it depends on how long you're going to store them and what the ambient temp would have been had you not stuck 'em in the fridge.
    I think you are talking about this -> http://www.stefanv.com/electronics/sanyo_eneloop.html

  4. #34
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    Default Re: Best way to maintenence Eneloops?

    So what would be the best way to charge and maintain Eneloops with the LaCrosse BC-9009? They are usually charged every several months.

  5. #35

    Default Re: Best way to maintenence Eneloops?

    Will my eneloops be ok in this charger for now?
    http://data.energizer.com/PDFs/CHDC.pdf

    I plan on ordering the eneloop charger when I get some more batteries, but will that do for now?

  6. #36
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    Default Re: Best way to maintenence Eneloops?

    here is one for you guy's -
    I have about 25 pcs AA Eneloop cells (a few too many apparently) - that were not getting used/cycled very often over the last year or two.

    So after reading these posts - I put them all through a refresh/analyze and also a break-in on my MH-C9000 - and those that were not showing good capacity (below 1900) I ran a few more times through a refresh/analyze several times more, and if needed also a break-in or two...
    all of these cells ended up at approx 1950-2000mah range

    EXCEPT for two cells!
    these two cells got better after 1-2 R/A then got worse each time thereafter - and are now down to low 1700maH
    (These two have probably been R/A 8-10 times and B-I about 4 times)

    Any ideas?
    run several more R/A, or B-I, or cycles, or save them for backup use?



    NOTE: have about a dozen AAA's that refreshed to expected levels.
    Last edited by lebox97; 07-24-2009 at 08:58 AM.
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  7. #37

    Default Re: Best way to maintenence Eneloops?

    I'm storing all my batteries in the fridge when not in use (Eneloops, Tenergy D Premiums for my TK70 and 18650s - all of them around 50% charged). Is there anything wrong with that habit?
    (I'm trying to cycle them regularly.)

    I researched with Google and here in CPF posts but can't find a definite answer. PLEASE PLEASE HELP.
    "Do not Weep. I shall draw all Things which perish into myself When I am lifted from the Earth." ~ Begotten (1991)

  8. #38
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    Default Re: Best way to maintenence Eneloops?

    Hello Anzycpethian,

    50% charged is good for Li-Ion, and OK for NiMh cells. NiMh cells actually do a little better when they are discharged to 0.9 volts at a 1C discharge rate. Then you do a charge/discharge cycle frequently. If you want to keep them in top condition you run the cycle once a month. They will also do quite nicely if you stretch that out to once every three months.

    Eneloop and other low self discharge cells are a little different. Most people charge them up and have them ready to go. Extended storage in a charged condition doesn't seem to effect their performance very much. Storing at 50% charge in cool temperatures may give you a little better results, but I don't think anyone has tested those conditions.

    Tom
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    Most batteries don't die - they are tortured to near death, then murdered...

  9. #39
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    Default Re: Best way to maintenence Eneloops?

    I run them down in the device (flashlight,radio etc) as low as they can go, then charge them up fully and put them in storage rotation in a drawer. They seem to like being run right down then to receive a full charge. Half discharges or charges they dont seem to hold charge as long. In rotation they get used and charged about once or twice a month.

    Cheers

  10. #40
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    Default Re: Best way to maintenence Eneloops?

    I find having teenagers who use X-Box remotes are very useful for cycling cells. The remotes drain the cells fairly completely.

    Unfortunately the expense of feeding the teenagers negates any cost savings to be had from going to Eneloop rechargeables.

  11. #41
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    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by tandem View Post
    Unfortunately the expense of feeding the teenagers negates any cost savings to be had from going to Eneloop rechargeables.
    Good one, tandem

  12. #42

    Default Re: Best way to maintenence Eneloops?

    I subscribed to this thread because it was very important to me and now just by chance I see that gmail treats the update-on-the-thread-mail as spam, argh...

    Anyway, thank you for your answers!
    "Do not Weep. I shall draw all Things which perish into myself When I am lifted from the Earth." ~ Begotten (1991)

  13. #43
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    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by Anzycpethian View Post
    ...I see that gmail treats the update-on-the-thread-mail as spam, argh...
    <rant> In my experience, so-called "spam filters" are the cure that is worse than the disease. The part I hate most is when they refuse me the option of turning the damned things OFF. </rant>


  14. #44
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    Quote Originally Posted by Anzycpethian View Post
    I subscribed to this thread because it was very important to me and now just by chance I see that gmail treats the update-on-the-thread-mail as spam, argh...
    Try adding the Candlepower 'Sender' address to your Contacts List / Address Book and see what happens.

  15. #45
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    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by Anzycpethian View Post
    I subscribed to this thread because it was very important to me and now just by chance I see that gmail treats the update-on-the-thread-mail as spam, argh...
    That is easy to fix. In the spam folder, select the mails that aren't spam ... and hit the "Not spam" button. Gmail will stop treating them as spam.

  16. #46
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    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by Danne71 View Post
    What is the point of buying lsd batteries if you cant store them? I thougt charging them every 3-4 month made them vital. Sanyo says it holds 85 procent after one year. They should have put a warning that storing a eneloop this long could harm the batteries. Is there any evidence that storing a eneloop for a couple of months is not good for them? I mean they havent been on the market long enough for this to be tested.
    Quote Originally Posted by Yoda4561 View Post
    It doesn't harm them, but you're only going to get 90% performance out of them instead of 100% after a couple years. It's fine if you just do the discharge-breakin every few years, they'll pick right back up. Some folks just like to keep things in top condition.
    Quote Originally Posted by travelinman View Post
    It sounds like people are collecting cells and have waay too many. Our use of NiMH cells shows exactly what has been discussed here. Have just enough that you can use them regularily. Any "extras" that you have, give them away to people that can use them regularily.

    Like taketheactive says "use em or lose em".

    Hot light, the refresh cycle on the BC 900/700 actually tests each cell by charging it up, then discharging and noting the capacity, then it does it again and compares the capacity with the last cycle. It continues these cycles until it see no further gain in capacity. It's a great way to refresh your cells.

    I use it all the time and rarely use more than 200 ma charge (the default). I have the time, its a perfectly safe machine, just set it up and let it run. Go have fun while it's taking care of business.


    I thought i'd highlight a few posts in here. Over the past few days i have been refreshing a set of 2300mAh Energizer Power Plus LSD batteries and noticed 2 of them were showing 95% capacity (still refreshing) while the other 2 are showing 98%. Since the first set was currently being used in my EDC light and had to be initially charged i'm pretty sure i didn't leave them trickle charging for long. The other set was being recharged when they were already substantially full so i kinda wonder if i had overcharged the second set or if putting an additional charge after it was left sitting for about a month was actually better. Since those Energizers are nearly 2 years old (dated Jan 2 2013) they were not 'vibrant' but they did show a few discharges increased performance.

    I only discharged near full when i bought them (August 19 2014) but never ran them through a discharge/charge cycle. At least i know Eneloops do not need to be cycled, but since they have plenty of cycles on the standard 2 amp batteries it doesn't hurt to do a break in cycle during initial purchasing. From testing my Energizers i am trying to determine whether 'topping' off the batteries after they have been sitting for about a month is better than recharging them from a 40-60% charge to cycle them. They do seem to handle themselves pretty well in storage and 98% isn't bad. I plan on doing another refresh on these batteries by July of 2015 to see whether they maintain the 98% or will increase or decrease by adding a trickle charge to them. Won't do more than a couple of hours of a top off charge, the 95% set was on trickle charging mode for 40 minutes while the 2nd set was only on trickle mode for about 10-15 minutes. All batteries were cycled at 250/500mA in the BC1000 La Crosse charger.

    As for keeping extra cells, i'd say long as you cycle them every 2 or 3 years they should be fine to keep in storage. The entire point of having LSD rechargeables is to replace the alkaleaking batteries. I wonder if anyone has tried refreshing 5 year old Eneloops that have been sitting in storage to see their capacity and see how they hold up in long term storage.



    Quote Originally Posted by Samy View Post
    I run them down in the device (flashlight,radio etc) as low as they can go, then charge them up fully and put them in storage rotation in a drawer. They seem to like being run right down then to receive a full charge. Half discharges or charges they dont seem to hold charge as long. In rotation they get used and charged about once or twice a month.

    Cheers
    I haven't noticed too much of a difference, the voltage might be a bit lower. I did this every so often with my 2006 AAA Energizers that still hold 70% charge. Realizing though it might be more beneficial to run them all the way down in the La Crosse charger as they will only be run down to a safe level avoiding overdischarging the batteries. Other than that though running them half way hasn't bothered any of my LSD batteries just take them out after they finish charging . In fact taking them out when they reach 1.46 volts might not be a bad idea either. I use a rule of thumb of the more use the battery gets the more often you should fully discharge them but they don't require it every cycle. I'd say for every 10 or 15 cycles, run them down fully.
    Last edited by MidnightDistortions; 12-10-2014 at 09:13 AM.

  17. #47
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    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by MidnightDistortions View Post
    I wonder if anyone has tried refreshing 5 year old Eneloops that have been sitting in storage to see their capacity and see how they hold up in long term storage.
    Funny you mention that. I just cracked open a pack of Gen 1 Eneloops about 2 weeks ago. Their date stamp says they were manufactured in 2009, though I forget when I actually bought them. But dammit, I forgot to measure their voltage level to see what kind of charge they had on them. Anyway, I just charged them up and they work fine. I haven't checked to see if there's any decrease in capacity... maybe I'll check that out. I know my 2006 Eneloops still have close to their full capacity, although they're still used in stuff and so haven't sat idle for years.

  18. #48
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    Default Re: Best way to maintenence Eneloops?

    Quote Originally Posted by WalkIntoTheLight View Post
    Funny you mention that. I just cracked open a pack of Gen 1 Eneloops about 2 weeks ago. Their date stamp says they were manufactured in 2009, though I forget when I actually bought them. But dammit, I forgot to measure their voltage level to see what kind of charge they had on them. Anyway, I just charged them up and they work fine. I haven't checked to see if there's any decrease in capacity... maybe I'll check that out. I know my 2006 Eneloops still have close to their full capacity, although they're still used in stuff and so haven't sat idle for years.
    Lol, darn! If only i refreshed my Energizer cells 2 weeks ago.. well at least after 5 years those 2009 Eneloops still work fine and you can still see what their max capacities are. Yeah usually NiMH cells are pretty vibrant when they are used, still these Energizers are proving to be good LSD cells. I'm keeping track of how many recharges the 2300mAh Energizer cells have but mostly because i couldn't find any info on the general cycle life they have. I should have left the only set of April 2014 Eneloops i got with the 16 pack in the package but i'm FIFO (first in, first out/using the oldest first) obsessive.

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