Efest 26650 4200ah 50A IMR, 3.7 volt, high discharge rate IMR lithium ion battery.

Nominal Voltage: 3.8v Battery

Model: 26650
Capacity: 4200mAh
Maximum Discharge current: 20A
Maximum Pulse Discharge Current: 50A

Caution Notes:
- Do not over-discharge/overcharge
- Recharge empty batteries (resting voltage ~3.6V) as soon as possible. Leaving Li-Ion batteries in discharged state will incur irreversible damage (capacity / cycle loss)
- Do not short circuit (will release tremendous current)
- Do not dispose of in fire. We do not recommend unprotected batteries in devices that they're not recommended to be used in, use at your own risk.