The SIP FIREBALL 18v 5.2Ah Lithium Battery Pack is designed for SIP FIREBALL Cordless Propane Heaters, perfectly acting as a spare which gelps to increase the amount of time a heater can be in use. Simply switch the battery and continue delivering powerful heat. The complete SIP FIREBALL range is ErP-compliant, meaning higher savings for you and lower emissions for the planet. • High-quality 18v DC 5.2Ah Lithium battery • Ideal as a spare battery for when your other runs out of charge, simply swap batteries over and continue delivering powerful heat output • Perfect for SIP FIREBALL 515 and 1050 Cordless Propane Heaters