Tiny 10mAh Li-polymer battery. What to charge it with?

Discussion in 'The Projects Forum' started by kender, Sep 1, 2012.

  1. kender

    Thread Starter Senior Member

    Jan 17, 2007

    There are extremely small Li-polymer batteries with 10mAh capacity. Like this one:

    [​IMG] (source)

    I’d like to charge a battery like this with a CCCV profile. The CC would be 0.7C, which is 7mA. So, I went looking for linear charger ICs (e.g. MAX1555). Some of them have an adjustable charge current, but, the lower limit doesn’t extend down to 7mA range. I wonder what folks are using for charging these batteries?

    Any suggestion, insight or reference is really appreciated!

    - Nick
  2. DickCappels


    Aug 21, 2008
    It depends on how well you want to charge it. I think you can safely charge it at 1/10 capacity; that is just use a resistor to charge it at 1 ma or maybe a little less. The more sophisticated methods can get you a faster charge and more energy stored n the capacitor than this simple approach.