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The Fogstar Energy FS4000 21700 Battery delivers powerful and dependable performance with its 4000mAh capacity and 25A continuous discharge rate, making it an excellent choice for high-demand vaping devices.

Engineered for vapers who expect strong output and long-lasting reliability, the FS4000 provides consistent power for advanced and high-wattage vape kits. This flat-top, non-protected cell is designed specifically for regulated devices that include built-in safety protections, ensuring optimal performance while maintaining safe operation. Always confirm your device supports 21700 batteries before use.

As part of Fogstar’s respected Energy series, the FS4000 is rigorously tested to meet strict quality standards. For safe use, charge only with a proper Lithium-Ion charger, routinely check battery wraps and insulators for any signs of wear, and replace damaged batteries immediately.

Additional Information
• Only use according to the manufacturer’s instructions.
• Lithium-Ion cells should be charged on a dedicated charger rated specifically for Lithium-Ion cells.
• Never leave a battery unattended whilst charging.
• Keep away from animals and children.
• Wraps and insulators should be periodically inspected for tears or damage. If a battery has a damaged wrap, it should be repaired or disposed of immediately.
• Batteries usually have a cycle life of between 200-500 cycles (this varies with manufacturer) before noticeable capacity drop-off. Batteries should be recycled at this time.
• Do not crush, incinerate or modify.