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Thread: Dead NiZn > Discharged fully for months

  1. #1

    Default Dead NiZn > Discharged fully for months

    Hi guys,

    I had some Nickel Zinc batteries in my handwarmers sitting for months, and decided to check them yesterday and found they are all at 0.2V ( Dead ), let's say 4 out of 6 take only max 3mah, what does it cause to not charge anymore ?

    I know you should not discharge them down to 0v ( but to 1.3v and then recharge ).

    Should i contact the seller about it ? They are less then 7 months old.
    For sure they tell me send the old ones back and you will get new ones, i still have 7 out of 8. 2 are still ok ( let's say 900~1100mah out of 1500 ).

    Reason of not using alkalines is because the handwarmers draw the batteries down to 1v in less then 4 hours.

    I have more luck with nimh batteries.
    Last edited by daan_deurloo; 06-19-2017 at 10:52 AM.
    Proud to be dutch

  2. #2
    Flashaholic* TinderBox (UK)'s Avatar
    Join Date
    Jan 2006
    England, United Kingdom

    Default Re: Dead NiZn > Discharged fully for months

    NiZn battery`s have to be treated with kit gloves, don't overcharge or overdischarge even then the seem to die, they are not really worth buying, I wanted them for the higher voltage than nimh battery`s for my ancient sony mp3 player as the battery gauge does not show full for long on nimh battery`s but even them they seemed to go flat even when unused for a couple of day`s in the player.

    "Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life." - Terry Pratchett.

  3. #3

    Default Re: Dead NiZn > Discharged fully for months

    Have an upodate on these batteries.

    inserted them in my charger again and made 1 cycle.

    First one took no more then 3 mah charge and 1mah discharge.

    Charging again and one took over 1000mah already, weird isn't it ? Hope they do well on discharge also.

    They are not even heating up, so that might be a good sign.
    Proud to be dutch

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