The Husqvarna 599404603 Sprayer Lithium-Ion Battery Backpack 2.1AH 18V provides portable battery power for compatible Husqvarna battery-powered sprayer applications. This lithium-ion battery is designed to supply 18V power to the equipment while the backpack-style design allows the battery to be carried comfortably during operation. It is a practical replacement for an old, depleted, ... https://www.wholetoolbox.com/husqvarna-599404603-sprayer-li-ion-battery-backpack-2-1-ah-18v/599404603.html