How to Select a Lithium-Ion Battery Charge Management IC | Article | MPS
LiPo USB Charger Hookup Guide - SparkFun Learn
Charging protocols for lithium-ion batteries and their impact on cycle life—An experimental study with different 18650 high-power cells - ScienceDirect
USB LiIon/LiPoly charger [v1.2] : ID 259 : $12.50 : Adafruit Industries, Unique & fun DIY electronics and kits