Auto cut off 3.7 volt Battery Charger Circuit without Relay - YouTube
Voltages | Li-Ion & LiPoly Batteries | Adafruit Learning System
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3.7v Lithium Battery Level Indicator
Lithium Ion Polymer Battery - 3.7v 100mAh : ID 1570 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits