Wonky battery or wonky BT keyboard?

Discussion in 'Mac Accessories' started by iamsen47, Mar 28, 2013.

  1. iamsen47 macrumors regular

    Joined:
    Aug 18, 2012
    Location:
    Kobe, Japan
    #1
    I have the Apple BT keyboard, been using it for about half a year. I put in a fresh set of batteries about 3 months ago. It remained at 100% the whole time but in the past couple of weeks, it's drained exceedingly quick.

    I usually turn it off when I'm not using it. When I turn it back on, it's somewhere around 40~50%. Along the course of the day, it slowly drains till ~15%. Sometimes it cuts off.

    Is this typical behaviour?
    I know batteries restore their charge when left unused, but 20% -> 50% is quite a huge variation.
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
    I know it's very basic, but have you made sure the batteries are installed facing the right direction?
     
  3. iamsen47 thread starter macrumors regular

    Joined:
    Aug 18, 2012
    Location:
    Kobe, Japan
    #3
    Yes I have.

    Batteries were 43% when I made that post. It's 18% now.
     
  4. Giuly, Mar 28, 2013
    Last edited: Mar 28, 2013

    Giuly macrumors 68040

    Giuly

    #4
    If you are using eneloops or Apple rechargeable batteries, that's normal. Low self-discharge NiMH batteries (read 'eneloops') keep their charge around 1.3V for the most time, but then drop rapidly. Regular AA alkalines have a different discharge curve.
    [​IMG]

    And as Apple's charge sensing mechanism seems to be adjusted to alkalines, the meter drops to 50% relatively quickly, but stays there for the most time, and then drops rather quickly towards 0%. Usually, consumer electronics shut off at 1.1V.
     
  5. iamsen47 thread starter macrumors regular

    Joined:
    Aug 18, 2012
    Location:
    Kobe, Japan

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