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high-capacity AAA NiMH batteries - who sells them?

Discussion in 'Hobby Electronics' started by BW, Sep 16, 2012.

  1. BW

    BW Guest

    I was seeking some AAA batteries for a cordless phone, to extend the
    talk time. The existing batteries
    are 970 mAh, so I was hoping to get some 1300 mAh. Local shops don't
    seem to stock anything over
    1000 mAh. On fleabay, there are tons of Asian vendors offering 1300
    mAh, but these are brands I never
    heard of. Also, I saw two sellers with pictures of the same battery,
    and one claimed it is 1300 mAh, but
    the other seller lists it as only 1250 mAh. I start to wonder if any
    of them are truly rated.
    Has anybody found any AAA that really has the extra stamina?
     
  2. Sylvia Else

    Sylvia Else Guest

    Are you sure it's their capacity that's the issue and not their
    self-discharge rate? How long are you leaving the phone between charges?

    Sylvia.
     
  3. terryc

    terryc Guest

    Try Jaycar.com.au.Caveat, not sure of exactly what they have.
     
  4. BW

    BW Guest

    Generally, I leave the phone on charger until it shows full charge.
    Leaving it there full time will reduce the battery life, as it is not
    a smart charger. Even when showing full charge, it only lasts 60
    minutes (the trouble and strife can natter this long with any of
    her gossiping friends). When she was away for a week, the battery took
    about 5 days to go flat.
     
  5. Sylvia Else

    Sylvia Else Guest

    OK, so not a self-discharge issue. Sounds like a higher battery capacity
    would simply result in longer conversations though.

    1 hour seems a very short talk time. Maybe she's already trashed some of
    the batteries by overdischarging them:

    http://en.wikipedia.org/wiki/Nickel-metal_hydride_battery#Over-discharging

    I looked around the net, as you have obviously done, but didn't find
    high capacity cells from reputable suppliers either. There's clearly a
    theoretical upper limit on the capacity of a cell of a given volume or
    mass, and 1300mAh may be pushing it for an AAA.

    Maybe it's time to look at a new phone instead? I brief search revealed
    this page:

    http://cordless-phones-review.toptenreviews.com/

    Sylvia.
     
  6. Sylvia Else

    Sylvia Else Guest

    Replacing the phone is bound to be cheaper than replacing the wife.

    Sylvia.
     
  7. Sylvia Else

    Sylvia Else Guest

    I was more thinking of the ongoing costs of getting rid of the old one.

    Sylvia.
     
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