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Thread: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & NiMH

  1. #31

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    I've repeated the test with the same results. My jetbeam i2 is definitely trickle charging li-ion batteries. Selfbuilt could you leave some 18650 li-ion batteries in the charger for four days? I'm wondering what will be their voltage after that.

  2. #32

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by jirik_cz View Post
    I've repeated the test with the same results. My jetbeam i2 is definitely trickle charging li-ion batteries. Selfbuilt could you leave some 18650 li-ion batteries in the charger for four days? I'm wondering what will be their voltage after that.
    Ah, so you are usung the two-cell i2 version? Still, it should perform the same. I will run some cells in my i4 PRO for a couple of days and see what happens.
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  3. #33

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Yes, I'm using two cell version i2.

  4. #34

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Just tested three AW 18650 cells in my i4 PRO.

    The first cell was pulled as soon as the charger lights went solid - resting voltage was ~4.20V
    The second cell was pulled 24 hours later (charger remained plugged in) - resting voltage was ~4.18V
    The third cell was pulled 48 hours after the first (charger remained plugged in) - resting voltage was ~4.19V

    So it looks like my charger is remaining properly terminated when the light goes solid, as my earlier direct measures indicated. No sign of trickle charging.
    Full list of all my reviews: flashlightreviews.ca. Latest hobby: whiskyanalysis.com. New: Selfbuilt's Spring 2018 Sale
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  5. #35

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    great review, thanks

  6. #36

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Hello guys, I spotted this thread from google search and decided to register here on CPF.

    Firstly, a very nice review, thank you selfbuilt for it!

    Secondly, I just bought this "interllicharger" from ebay to be a safer option to recharge my unprotected cells (salvaged from a new laptop battery which had bad electronics and therefore didn't charge) than my trustworthy Trustfire TR-001 charger, and maybe to get few more charge cycles out of the cells too. Unfortunately I'm not so sure about that anymore because I'm having a slight but still nerving overcharging problem with this i4 PRO.

    With the Trustfire charger (and my nameless dealextreme backup charger) the charging light turns green when my batteries/cells are at 4.17 to 4.2 volts, depending on the age of the cells. Measured & averaged with two DMM's, although cheapo ones. If I then put the cells to the i4 PRO, it continues the charging process until they are at 4.24 to 4.27 volts! I'm talking about resting voltages measured couple of hours after I have removed them from the charger. After resting some 16 hours the worst battery I have, had gone down from 4.25 to 4.17 volts. It's nearing the end of its life. But the healthier ones were still at 4.24-4.26V range.

    The cells never got hot during the charging which gives me little peace of mind, but I'm still wondering if this charger will impact negatively to the lifespan of the cells...getting close to 4.3V can't be very healty for them?

  7. #37

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    If the cells are more then 4,20V when you pull them out of the charger, it will definitely shorten their lifespan. Seems like I'm not the only one who has overcharging Interllicharger...

  8. #38

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by jirik_cz View Post
    If the cells are more then 4,20V when you pull them out of the charger, it will definitely shorten their lifespan. Seems like I'm not the only one who has overcharging Interllicharger...
    Yes it seems so. Although my i4 isn't trickle charging in any way. Are you sure yours is? I left one cell in the charger for 24 hours and after that it was at 4.24V. I'm quite sure it would have been around 4.26-4.27 volts if I had removed it straight after the charging was completed.


    Quote Originally Posted by selfbuilt View Post
    On the new i4 PRO, the bottom LED is always lit, and the unit cycles through the second and third LEDs to indicate the battery is charging (i.e., they flash on/off, in sequence).
    By the way the bottom led isn't always lit, the voltage treshold for it to become solid is just very low. I had one cell at 2.8V when I started to recharge it and all of the three leds were climbing up then and after around half an hour the bottom led became solidly lit. I'm assuming the voltage treshold for the first led to become solid is somewhere just north of 3 volts. Compared to that I took one cell out of the charger just after I noticed the second led being solid and measured the voltage of the cell. It was already at 4.18 volts by then and it couldn't have been more than 5 minutes on that third stage yet... So the leds are pretty useless at least on my unit: If the voltage is under 1st solid led it means the cell is quite deeply discharged. 2nd solid led it means the battery is already full by any cell life prolonging standards. 3rd solid led means it's quite noticeably overcharged.

  9. #39
    Flashaholic* Rexlion's Avatar
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    If a unit were overcharging, I'd try to return it for an exchange or refund. Overcharging cells is not acceptable IMO.
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  10. #40

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by Rexlion View Post
    If a unit were overcharging, I'd try to return it for an exchange or refund. Overcharging cells is not acceptable IMO.
    Agreed. But on the other hand I don't have 100% confidence regarding my cheapo DMM. Only thing I'm sure of is that my Trustfire TR-001 and the other nameless charger is charging the cells to some .05 - .10 lower voltage treshold. Though while doing it the cells are getting noticeably warmer than with the interlllicharger i4 PRO. It seems those cells aren't the source of the heat itself, but the charging circuit which then conducts the heat to the cells via + -terminal. Win some, lose some, I guess.

    If I decided to return it, shipping costs would be somewhere near 50% of the price of the whole unit. Oh well. I still have 2 protected 18650 batteries that are working fine and 24 unprotected 18650 cells that are nearly new. Maybe I can afford to fry some life out of them.

  11. #41

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    I think the above discussion underscores the need to invest in a decent DMM when working with Li-ion cells. Personally, I wouldn't trust ANY charger to terminate at a reasonble level without testing resting voltages myself. While a few millivolts above 4.20V won't make a huge difference, values nearing ~4.25V should be strenously avoided.

    I don't mean to suggest everyone should run out and get a Fluke, but you should be willing to spend at least as much (and preferably a little more) on a decent DMM than you would on any given charger.
    Last edited by selfbuilt; 03-22-2013 at 06:45 AM.
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  12. #42
    Flashaholic* Rexlion's Avatar
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    I'll suggest it, though. Everyone should run out and get a Fluke! It's fun having a good meter, just like it's fun having a good light.
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  13. #43
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by Rexlion View Post
    I'll suggest it, though. Everyone should run out and get a Fluke! It's fun having a good meter, just like it's fun having a good light.
    You can get other good meters, try a Agilent. They are just as good as Fluke (Ok, I will admit that I only have one Agilent and 7 Fluke, but I tried to get a 2/6 score, except I could not find anywhere to buy the Agilent I wanted).
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  14. #44
    Flashaholic* Russel's Avatar
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Gossen Metrawatt also makes some excellent quality multi-meters, although very pricey even compared to Fluke.

  15. #45
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by Russel View Post
    Gossen Metrawatt also makes some excellent quality multi-meters, although very pricey even compared to Fluke.
    I love their Energy meter and Fluke has nothing that can compare to that.
    My usual test DMM's:
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  16. #46

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Okay, my i4 is definitely overcharging. Still don't have a fluke, but one of my protected batteries got fried for good just after 2 charging cycles. Resting voltage dropped from 4.27V to 3.5V overnight, so it doesn't hold it's charge anymore.

    After that I noticed one other protected battery made i4's charging channel go offline when the charging was nearly completed according to i4. All the charging leds went off. Removed and after a while reseated to other channel. Charged for a few minutes and same thing happened. So the batterys own protecting circuit cut off the charging process twice before i4 did. Now I'm worried. This charger is lethal to the batteries.
    Last edited by dazler; 04-03-2013 at 07:32 PM.

  17. #47

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by dazler View Post
    Okay, my i4 is definitely overcharging. Still don't have a fluke, but one of my protected batteries got fried for good just after 2 charging cycles. Resting voltage dropped from 4.27V to 3.5V overnight, so it doesn't hold it's charge anymore.

    After that I noticed one other protected battery made i4's charging channel go offline when the charging was nearly completed according to i4. All the charging leds went off. Removed and after a while reseated to other channel. Charged for a few minutes and same thing happened. So the batterys own protecting circuit cut off the charging process twice before i4 did. Now I'm worried. This charger is lethal to the batteries.
    That's exactly what it sounds like is happening - your charger is over-charging the cells until the built-in protection circuits are tripped (usually by ~4.28V).

    Do not use that charger again - it should be returned.
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  18. #48

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    I'm a bit wary of substandard chargers or even fakes.
    Can anyone please recommend an ebay seller to buy an i4 pro from?
    I'm in the UK but not in a rush so a HK seller is fine.

  19. #49

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Nice review, thanks!


  20. #50

    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Hello, I am a new flashaholic, just got the bite after acquiring a Fenix TK41U then added a LD22 G2, PD32 UE and my fav TK75. I ordered the JetBeam Pro i4 from Amazon and it is listed as the ver 3 2013 enhanced model. Being new to 18650's and learning as much as I can about safety and chargers is this one any different than the pro model being discussed here?

    Thank you for any help and love my new hobby!

    Sean

  21. #51
    Flashaholic* RI Chevy's Avatar
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni



    I have not heard of any newer charger other than the one listed in this thread.

  22. #52
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by RI Chevy View Post


    I have not heard of any newer charger other than the one listed in this thread.
    Check these out:

    http://www.cpfmarketplace.com/mp/sho...d-shipping-now!!!!!


  23. #53
    Flashaholic* RI Chevy's Avatar
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    Default Re: Jetbeam i4 PRO Intellicharger Review: Current/Voltage Comparisons for Li-ion & Ni

    Quote Originally Posted by vespagt200 View Post
    Hello, I am a new flashaholic, just got the bite after acquiring a Fenix TK41U then added a LD22 G2, PD32 UE and my fav TK75. I ordered the JetBeam Pro i4 from Amazon and it is listed as the ver 3 2013 enhanced model. Being new to 18650's and learning as much as I can about safety and chargers is this one any different than the pro model being discussed here?

    Thank you for any help and love my new hobby!

    Sean
    Quote Originally Posted by TEEJ View Post
    I thought we were talking about the Jetbeam Pro I4 charger?

    Although I am very familiar with the Xtar VP1.

  24. #54
    Flashaholic srmd22's Avatar
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    Thumbs up Great review: Hope I don't fry my new batteries.

    Great review, as you always do, Selfbuilt.

    I just picked one up from Amazon, and I have a batch of 4 brand new Orbtronics 3400mAh on there. Maybe I should have tested with just one, now that I see some of the units may overcharge. I may just pull a few off before I go to sleep, and just let one finish the cycle. Does stopping and restarting the charge cycle damage the battery at all, with LiCo?

    PS: I have a Pila charger as well, but I grabbed this so I could charge 4 at once, for my new incoming 3 and 4 * 18650 torches.
    Last edited by srmd22; 05-01-2013 at 06:13 PM.

  25. #55
    Flashaholic* RI Chevy's Avatar
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    Default Re: Great review: Hope I don't fry my new batteries.

    You can pull Li-Ion batteries off the charger prior to receiving a full charge without doing any damage to the cell. I personally would use the Pila charger over the other charger. AND you shouldn't leave the batteries on the charger overnight while you go to sleep. Not very safe in my opinion. Always monitor the charge cycles.

  26. #56

    Default Re: Great review: Hope I don't fry my new batteries.

    Quote Originally Posted by srmd22 View Post
    GMaybe I should have tested with just one, now that I see some of the units may overcharge. I may just pull a few off before I go to sleep, and just let one finish the cycle. Does stopping and restarting the charge cycle damage the battery at all, with LiCo?
    Quote Originally Posted by RI Chevy View Post
    You can pull Li-Ion batteries off the charger prior to receiving a full charge without doing any damage to the cell. I personally would use the Pila charger over the other charger. AND you shouldn't leave the batteries on the charger overnight while you go to sleep. Not very safe in my opinion. Always monitor the charge cycles.
    Yes, there is no problem with pulling Li-ions off the charger early. I also agree about not leaving cells on a charger over night. As a general rule, the greatest risk of an incident with Li-ions is during the charging phase (as opposed to primary cells, where it is in the discharging).

    Given the over-charging report by a member in this thread, I would strongly recommend you confirm the resting voltage of your cells at termination with a DMM. Of course, that is useful advice for any charger.
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  27. #57
    Flashaholic srmd22's Avatar
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    Default Re: Great review: Hope I don't fry my new batteries.

    I tested 4 new 3400mAh and one older 2200 mAh 18650 cells at termination:
    Pila: 1 cells at 4.20
    i4: ranged from 4.09, 4.13, 4.17, 4.21

    I put the 2 with lower volts on the Pila, and they topped off at 4.17 and 4.18.

    I am thinking the 4.21 from one of the i4 bays is probably ok, given the probable standard deviation of accuracy in most electrical testing equipment. I still will use the i4 when I need to charge more then 2 batts at once, just way ore efficient then hanging around for multiple cycles.

    I'm hoping the termination circuits in these things are reliable, because I don't have time to hang around babysitting the charger everytime I charge up a batch. If not, I would go to another chemistry. (I do use a lot of eneloops in my AA and AAA lights and gadgets).

  28. #58
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    Default Re: Great review: Hope I don't fry my new batteries.

    So far ran three sets of 4 through it. Each measured from 4.24 to 4.26 so will grab another meter tomorrow to double check. If its what I think, its going back.
    Keep it between the ditches and the shiny side up.

  29. #59

    Default Re: Great review: Hope I don't fry my new batteries.

    Great job as always selfbuilt. Did you happen to try unplugging the charger after all the batteries reached the full charge. Then just plug the power back in and see how the charger acted after that? It seems to act like it is resetting and starting over after you do that. Even though the batteries are fully charged.

  30. #60

    Default Re: Great review: Hope I don't fry my new batteries.

    Quote Originally Posted by Vortus View Post
    So far ran three sets of 4 through it. Each measured from 4.24 to 4.26 so will grab another meter tomorrow to double check. If its what I think, its going back.
    That's not good. If you consistently get that with a quality DMM, I would definitely send the unit back. Let us know more ...

    Quote Originally Posted by KILLER_K View Post
    Great job as always selfbuilt. Did you happen to try unplugging the charger after all the batteries reached the full charge. Then just plug the power back in and see how the charger acted after that? It seems to act like it is resetting and starting over after you do that. Even though the batteries are fully charged.
    Yes, it is indeed likely to do that - but you should find it terminates again with a matter of seconds to minutes. Given the very low current at termination, this won't affect the overall charge status.
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