Fogstar Energy FS4000 21700 Battery

The Fogstar Energy FS4000 21700 battery is built for vapers who need high-performance power for demanding setups. With a 4000mAh capacity and a robust 25A continuous discharge rate, this rechargeable cell is ideal for sub-ohm vaping and high-drain devices.

Engineered with durability and safety in mind, the FS4000 is a flat-top, non-protected battery, recommended for use in regulated devices with built-in safety features. As part of Fogstar’s Energy Series, each cell undergoes strict quality testing to ensure reliable performance and long-lasting power.

Key Features

• Battery Type: 21700 Lithium-Ion
• Capacity: 4000mAh
• Continuous Discharge Rate: 25A
• Voltage: 3.6V
• Rechargeable, Flat-Top Design
• Non-Protected Cell
• Perfect for Sub-Ohm and High-Drain Applications
• Designed for regulated vape devices

Safety Information

• Only use according to manufacturer’s instructions.
• Charge with a dedicated Lithium-Ion charger.
• Never leave batteries unattended while charging.
• Keep away from children and animals.
• Inspect wraps and insulators regularly for damage – repair or recycle if compromised.
• Expected cycle life: 200–500 charges before noticeable capacity drop-off.
• Do not crush, incinerate, or modify the cell.

What's in the Box

1 x Fogstar Energy FS4000 21700 Battery

Important Notes

Always confirm compatibility with your device before use. For maximum safety, replace worn batteries promptly and recycle responsibly at end of life.