18650 3.7v 4200mAh UltraFire Rechargeable Lithium Li Ion Battery For Electronic Cigarette LED Bike Light Heanlamp Flashlight From Kerwinlan, $1.53 | DHgate.Com
Amazon.com: DAUZ 3.7V Battery Li-ion Rechargeable Battery 4200mAh High Capacity Battery 3.7 Lithium Ion Battery Durable Button Top Battery for LED Flashlight, Electronic Devices Etc,2 Pack : Health & Household