JESSPOW Battery：Standard size: 18.60 65.02 mm. Product Information.
3.7V Rechargeable Battery, 3300mAh Flat Top Rechargeable Batteries for Flashlight, Headlamp (2 Pack, 18 X 65mm)
3.7 Volt Rechargeable Battery，3300mAh High Power Long Lasting 18650 Rechargeable Battery for Flashlight, Doorbell, Headlamp （4 Pack,18 x 65mm）
3.7V Rechargeable Battery，3300mAh Button Top Batteries High Power Lasting Long for Headlamp, LED Flashlight （2 Pack, 18 x 65mm）
3.7V Rechargeable Battery，3300Mah Button Top Batteries High Power Lasting Long f
3.7 V 18650 Rechargeable Battery Flat Top (2 Pack) with Charger, 3300mAh Large Capacity Rechargeable Batteries for Flashlight, Headlamp, Small Fan
