COMPACT DESIGN: This compact Ryobi 18V Lithium Ion battery gives you lighter weight for improved tool handling LIGHTER WEIGHT than most other batteries in this system prevents user fatigue ONE+ COMPATIBLE: This battery works on all One+ compatible Ryobi power tools, from the string trimmer to the reciprocating saw to the drain auger IMPROVED BATTERY LIFE over older NiCad models. Up to 4x more runtime FADE-FREE POWER: Don’t worry about your tools getting weaker as the battery drains. With this, you’ll be able to work at full power until the juice runs outv