Adafruit Micro Lipo - USB LiIon/LiPoly charger [v2] : ID 1304 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: VICMILE 7.4V Li-ion Battery 2000mAh 2S Battery with SM 2P Plug High Capacity Rechargeable Battery with 1 USB Charger for RC Car RC Boats H101 Battery 1 Pack : Cell Phones
3.7V 600mAh LiPo Battery Kit for Arduino — Maker Portal