Adafruit Micro Lipo USB LiIon/LiPoly charger v1

Oh, how cute, this is the smallest Lipo charger, so practical that you can keep it in any project box! It's also easy to use. Just connect the gold-plated contacts to any USB port and a 3.7V/4.2V lithium polymer or lithium-ion battery to the JST connector on the other side. There are two LEDs - one red and one green. During the charging process, the red LED lights up. When the battery is fully charged and ready for use, the green LED lights up. Seriously, it couldn't be easier.

The charging occurs in three stages: first, a pre-conditioning charge, then a constant current fast charge, and finally a constant voltage trickle charge to keep the battery topped off. The charging current is set to 100mA by default, so it works with any size of batteries and USB ports. If you want, you can easily switch it to the 500mA mode by closing the jumper on the back, but then you can only charge batteries that are 500mAh or larger.

For use only with Adafruit LiPoly/LiIon batteries! Other batteries may have different voltage, chemistry, polarity, or pin configuration.

* Comes assembled and tested with a free JST bonus cable!
* 5V input via a PCB-like USB connector
* For charging single lithium-ion/lithium-polymer 3.7/4.2V batteries (not for older 3.6/4.1V cells)
* 100mA charging current, adjustable to 500mA by soldering a jumper
* Free 2-pin JST cable included!

Batteries not included.