Ryobi P108 4AH One+ High Capacity Lithium Ion Battery For Ryobi Power Tools (Single Battery) ONE+ COMPATIBLE: Works with any power tool from the Ryobi One+ System. Use this on your cordless routers, circular saws, reciprocating saws, blowers, and more MORE POWER: This extra large battery holds over 4 times more power than the other, smaller models QUICK CHARGE: The P108 can be fully charged in as little as one hour FUEL GAUGE: An onboard fuel gauge lets you know how much power you have before it needs recharging FADE-FREE POWER: The P108 lithium ion battery will work at full strength for as long as the battery is charged, so you dont have to worry about your tools slowing down when it comes to crunch time ONE+ COMPATIBLE: Works with any power tool from the Ryobi One+ System. Use this on your cordless routers, circular saws, reciprocating saws, blowers, and more QUICK CHARGE: The P108 can be fully charged in as little as one hour FUEL GAUGE: An onboard fuel gauge lets you know how much power you have before it needs recharging FADE-FREE POWER: The P108 lithium ion battery will work at full strength for as long as the battery is charged, so you dont have to worry about your tools slowing down when it comes to crunch time