Lithium Ion Cylindrical Battery - 3.7v 2200mAh : ID 1781 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
18650 Charger Single Slot 2200mAh 3.7V 18650 800/1000/2000/2600 mAh Li-ion Battery Icr18650 From Battery Factory - China Battery Pack and Power Supply price | Made-in-China.com
Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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
Source 3.7V Intelligent power off Universal 1/ 2 Slots 18650 Battery Charger Adapter for rechargeable Battery 18650 on m.alibaba.com
ActionHeat 3.7V 2200mAh Rechargeable Battery Kit for Socks Rechargeable Lithium Ion (Li-ion) 18650 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Tovatec 18650 Li-Ion Battery and Charger IT18650 SET B&H Photo