Lithium Ion Rechargeable Battery - 18650 - 3200 mAh - 3.7 V – GuardDogSecurity
ATK 3.7v 18650 3400mAh Li-ion Rechargeable Battery (1-PK) | Highest Capacity 18650 Per Volume | These 18650 batteries are shorter and for Portable Fans, Laptops, and Other Flat Top High Drain Devices. - Walmart.com