Customizable 18650 1s2p 3.7V 4000mAh 4400mAh 5000mAh 5200mAh 5600mAh 6000mAh 6800mAh Lithium Ion Battery Pack - China 4400mAh 3.7V Li Polymer Battery, Lithium Ion Battery 18650 3.7V 4400mAh | Made-in-China.com
Black UltraFire 18650 High Capacity 6000mAh 3.7V Li Ion Rechargeable Battery For LED Flashlight Digital Camera Lithium Batteries Charger From Dream_high68, $0.94 | DHgate.Com
Best 18650 Battery For Flashlight 3500mAh (Free Battery Case) Orbtronic
Customized Lithium Ion Rechargeable Battery 18650 3.7V 4400mAh 1s2p Battery Pack for WiFi Camera - China 18650 Battery, Lithium Ion Battery | Made-in-China.com
Lithium polymer battery - Wikipedia
Lithium Ion Polymer Battery - 3.7v 1200mAh : ID 258 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits