4000mAh 18.0V Replacement Battery Pack for Firestorm Models This capacity replacement battery is designed as a direct dropin for compatible Firestorm devices. It restores reliable power and extends operating time for lights and portable equipment that use the A18 battery pack. Key benefits Restore device operation: Replaces worn or weak batteries to bring compatible devices back to predictable runtime. capacity: 4000mAh at 18.0V provides extended use between charges for longer tasks. Direct compatibility: Matches the form factor and connector of the original A18 battery for easy installation. Durable construction: Built with quality cells and a rugged housing to withstand routine use and handling. What it does and why you need it Replaces depleted or failing batteries so your equipment remains ready when you need it. Maintains consistent power output to support steady light intensity and device function during use. Avoids downtime caused by sudden battery failure by offering a straightforward replacement option. Compatibility Compatible with the following models and part numbers: Firestorm FS18RS, FSL18, FSL18 Flash Light, FSX1800HD, FSX18HD, GPC1800, GPC1800P, P/N A18, FS180BX, FS18BX, FS18FL, FSB18, NST2118 Specifications Capacity: 4000mAh Nominal voltage: 18.0V Function: Rechargeable replacement battery pack Fit: Designed to match original battery size and connector for listed models Practical applications and use scenarios Construction site evening work: a drained battery in a jobsite light to maintain illumination for inspections and finishing tasks. Emergency and backup lighting: Keep a fresh replacement on hand to swap into a flashlight or floodlight during power outages or vehicle breakdowns. Field inspections and photography: Use the battery in portable lights used for equipment inspections, outdoor shoots, or maintenance checks where consistent runtime matters. Simple installation and care Install the pack as a direct replacement for the original A18 battery, ensuring secure seating and proper contact alignment. Charge the battery using the approved charger for your device before first use. Store in a cool, dry place and follow local guidance for recycling or disposal of used battery packs. What is included One 4000mAh 18.0V replacement battery pack compatible with the listed Firestorm models and P/N A18. This replacement battery is a practical option when original battery performance has declined and a compatible, capacity pack is needed to restore reliable operation.