Adafruit 3.7V, 100mA Battery Charger

Comes assembled and tested with a free bonus JST cable!
5V input via Micro-B USB connector
For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)
100mA charge current, adjustable to 500mA by soldering a jumper closed
Dimensions: 21mm x 19mm x 2mm / 0.8" x 0.75" x 0.08"
We are currently shipping with a half thickness (0.8mm) PCB
Height w/ JST: 7mm x 0.3"
Weight: 2g