NITECORE -- Keep Innovating        
Results 1 to 7 of 7

Thread: How can I tell which rechargeable AA is bad?

  1. #1
    Unenlightened
    Join Date
    Apr 2017
    Posts
    3

    Default How can I tell which rechargeable AA is bad?

    I have 8 AAs, 4 bought in 2005 and 4 in 2010. They don't really work under that well with my camera. Freshly charged is ok but after 3 days they don't work. With my Lacrosse charger which indicates for each individual battery cell, they still report, 1600 or 2,100mah (2005 and 2010). I have also used the voltmeter and they give similar decent reading, 1.38 or 1.42V.


    I went out and bought some Eneloops with a charger - BQ-CC55 - which this site has a great review on. This charges the cells individually and has light indicators for each. All my 8 AAs had the red blinking light. Is this a good enough test to show that all my 8 batteries are bad? My other new Eneloops and my recent Energizers work fine on it.


    Thanks.

  2. #2
    Flashaholic*
    Join Date
    Oct 2002
    Location
    Baden.at
    Posts
    4,468

    Default

    What does the Charger Show?
    What it pumped IN the cells, or what got OUT?

    Charge them, leave 2 days, put them into with only a discharge program
    Check numbers after completion
    (Throw away the 1-2 cells that might be bad)

  3. #3
    Flashaholic* TinderBox (UK)'s Avatar
    Join Date
    Jan 2006
    Location
    England, United Kingdom
    Posts
    3,371

    Default Re: How can I tell which rechargeable AA is bad?

    As NiMh battery`s get older the internal resistance gets higher, the higher the resistance the faster the battery will self discharge without use, also when you charged they will get hotter.

    A lot of smart chargers will check the battery`s internal resistance before it starts to charge, But if the internal resistance is too high the battery will be rejected.

    John.
    SkyRC MC3000 - Maha C9000 - LaCrosse BC-900 - Floureon BT-C3100 V2.2 - Accumanger 10 and 20 -Thunder AC6
    LiitoKala Lii-100 - Cozypony 24W Solar Panel - Soshine H4 - Soshine T2 - Soshine E4S

  4. #4

    Default Re: How can I tell which rechargeable AA is bad?

    What camera? Years ago I got a Nikon point and shoot and it would not work with any NiMH even the Nikon branded ones. Basically if the voltage dropped below that of a fresh cell even a tiny bit it'd throw a dead battery warning and shut off. Pissed me off, I expected better from Nikon and couldn't even get a reply from their CS.

  5. #5
    Unenlightened
    Join Date
    Apr 2017
    Posts
    3

    Default Re: How can I tell which rechargeable AA is bad?

    Quote Originally Posted by N8N View Post
    What camera? Years ago I got a Nikon point and shoot and it would not work with any NiMH even the Nikon branded ones. Basically if the voltage dropped below that of a fresh cell even a tiny bit it'd throw a dead battery warning and shut off. Pissed me off, I expected better from Nikon and couldn't even get a reply from their CS.
    Nikon F100 film camera, takes 4 AAs. Film SLR.

  6. #6
    Unenlightened
    Join Date
    Apr 2017
    Posts
    3

    Default Re: How can I tell which rechargeable AA is bad?

    Quote Originally Posted by yellow View Post
    What does the Charger Show?
    What it pumped IN the cells, or what got OUT?

    Charge them, leave 2 days, put them into with only a discharge program
    Check numbers after completion
    (Throw away the 1-2 cells that might be bad)
    I have a trip soon. I need to alloc some time. However, I do recalled after the 3 days of being charged, they didn't work on my Nikon camera. I put them in my LaCrosse BC-900 charger and did a discharge only. Each of the 4 cells reported at least 1,600mah before I stopped it. The current being used was 500mA charge which was 250mA discharge.

    Do I need something like a ZTN battery tester so it test the battery under load?
    It seems like the batteries are fine under low drain devices.

    It is off a film SLR, Nikon F100.

  7. #7

    Default Re: How can I tell which rechargeable AA is bad?

    NiMH increasing impedance and dying out? Does this include the LSD cell like eneloop as well? Or this only affect the earlier normal NiMH with no joules left after few month? Kinda worrying since I have few eneloop still in the package, fresh and unused, like 6 years ago...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •