Wasp HC1 Li-Ion Battery, 3.7V @4000 mAh with Door - For Handheld Device - Battery Rechargeable - Proprietary Battery Size - 4000 mAh - 3.7 V DC - 1

Smaller and lighter than other rechargeable batteries, proving ideal for portable devices 3.7 V DC battery - Ensures a steady and uninterrupted supply to your handheld device Provides reliable power to your handheld device with a capacity of 4000 mAh Rechargeable battery - Lasts longer on a single charge than its disposable counterparts