Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Lithium Ion Cylindrical Battery - 3.7v 2200mAh : ID 1781 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Source 18650 Li-ion battery pack 2200mah /rechargeable lithium ion 3.7v 63.6wh on m.alibaba.com
Li-Ion Charger (Single Slot) + 2 x 18650 3.6V Li-Ion Button Top Batteries (
Amazon.com: Blomiky 3.7V 1200mAh 2 Pack Li-ion Rechargeable Battery with SM2P Plug and Charger Cable for Remote Control Cars Trucks 3.7V 1200mAh 2 : Toys & Games
Amazon.com: Blomiky 2 Pack 3.7V 600mAh Lithium Rechargeable Battery and 2 USB Charger Cable Compatible with Fisca Remote Control Robot Dog K9 Battery 2 : Toys & Games