18500 Battery Panasonic 2040mAh Li-ion Flat Top NCR18500A
Amazon.com: Taken 18500 Rechargeable Batteries, IMR 18500 1500mAh 3.7V Li-ion Rechargeable Battery with Button Top - 4 Pack : Health & Household
Amazon.com: Taken 18500 Rechargeable Batteries, 3.7V 1500mAh Li-ion IMR 18500 Battery with Button Top for Flashlight, Solar Garden Light - 8 Pack : Health & Household