Rechargeable battery can be charged again & again to keep your printer powered while you're on-the-go. Easy-to-use design installs & removes quickly to minimize your maintenance time. Lithium-ion technology provides powerful, long-lasting power for maximum efficiency. With a recharge time of less than 2-1/2 hours, this 14.4 volt battery prints more than 2,000 black on white labels during continuous printing on a full charge. Battery is designed for use with Brother label printers QL-810W & QL-820NWB (each sold separately).