4pcs 3.7 Volt Rechargeable Battery, SGIXBE 3500mAh Rechargeable Battery, Button Top NiMH High Power Long Lasting for Headlamp, LED Flashlight, Solar Light, Electronic Devices etc

[Reliable Button Top Battery] - Diameter: 18.8 mm, length: 68 mm. (Our battery is not suitable for the doorbell) [Real Large Capacity And Excellent Performance] - SGIXBE 3.7v battery has a real 3500 MAH, supports a stable output voltage of 3.7 V, and makes the equipment work more stable and durable.there are great replacement batteries for high frequently used devices. A fully charged battery can run your flashlight or headlamp for 2-4 hours / doorbell for 3-6 months / small fan for 3-4 hours. [Rechargeable 1000+ Times] - A single 3.7 Volt rechargeable battery can recharge up to 1000 charging and discharging cycles and no memory effect. Replace 1000+ disposable alkaline batteries, reduce the waste of resources and good value for the money. [Secure and Reliable] - 3.7 Volt rechargeable batteries is international professional organization certified and there are 6 protection measures(temperature control, leak protection, short-circuit protection, over-charge protection, over-current protection, over-voltage protection) [What You Get] - 8 Pack high performance 3.7 Volt rechargeable batteries, and excellent customer service - 12 months warranty and 7days / 24 hours friendly customer service. Suitable for low current draw applications such as the use in Power Banks, Power Packs - Power Storage , Flashlights, Lasers, and other devices.