The Fogstar Energy FS4000 is a rechargeable, unprotected flat-top 21700 lithium-ion cell combining 4000mAh capacity with a 25A continuous discharge rating and a 40A advertised maximum discharge.
Product details
- Model: FS4000
- Battery size: 21700
- Capacity: 4000mAh
- Nominal voltage: 3.6V
- Maximum charge voltage: 4.2V
- Continuous discharge rating: 25A
- Advertised maximum discharge: 40A
- Terminal: Flat top
- Protection: Unprotected cell
- Approximate size: 21.2mm diameter x 70.1mm
- One battery supplied
Use only in equipment designed for an unprotected flat-top 21700 cell and keep the current draw within the continuous rating. Regulated equipment with built-in protection is recommended.
Battery safety: Charge only with a compatible lithium-ion charger and never leave charging unattended. Never carry a loose cell with keys, coins or other metal objects. Inspect the wrap and positive-terminal insulator regularly, stop using a damaged cell, keep away from heat and children, and recycle responsibly.