Brand new 4000mAh single battery from AW.
- Size: 21700
- Nominal voltage: 3.70V
- Typical Capacity: 4000mAh
- Never leave chargers plugged in overnight.
- Keep batteries in a safe place when not in use.
- Never leave batteries unattended when on charge.
- Never keep Batteries in your pocket or purse. Always use the protective casings that are provided, or battery cases that are designed to protect batteries.