Datasheet

If you want to add an On/Off switch, we also made that really easy. The two 0.1" holes with
a box around them are the battery output line. Carefully cut the trace between them with a
hobby knife and replace with two wires from a switch like this slide
switch (http://adafru.it/drN), or this pushbutton one (http://adafru.it/1683), for example.
Charging is performed in three stages: first a preconditioning charge, then a constant-
current fast charge and finally a constant-voltage trickle charge to keep the battery topped-
up. The charge current is 100mA by default, so it will work with any size battery and USB
port. If you want you can easily change it over to 500mA mode by soldering closed the
jumper on the bottom, for when you'll only be charging batteries with 500mAh size or
larger.
© Adafruit Industries
https://learn.adafruit.com/adafruit-pro-trinket-lipoly-slash-liion-
backpack
Page 6 of 12