Ultrafire XSL 18350 1200mAh 3.7V Li-ion Battery( one pair)
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Amazon.com: 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
UltraFire 3400mAh 3.7V 18650 USB Rechargeable Lithium Battery with Pro