ONE+ AND BACKWARDS COMPATIBLE: Use this P102 Battery with any of your Ryobi One+ tools, from the reciprocating saw to the string trimmer. You can also use it on the older blue Ryobi tool system P117 CHARGER: Upgraded from the P118 model, including faster charging, an intelligent charging system, and a digital power gauge P102 BATTERY: 18 Volt Battery can be charged in just a half hour in the P117. Compatible with One+ Ryobi products SMART PORT TECHNOLOGY: Special charger design allows the P117 to know how much charge a battery has, automatically turn on if a battery loses charge, and turn off when it’s full, conserving energy REQUIREMENTS: 120V 60HZ input power and standard 2 prong North American plug