Ryobi P197 Battery ONE + (PLUS) Compatible Replaces P108 Rechargeable Lithium Ion 18 v Volt 4.0 Ah / 72 Wh UL Listed Faster Recharge Single Battery with Fuel Gage;

Ryobi 18-Volt ONE+ lithium+ High Capacity Batteries for the ultimate runtime and performance from your tools. The Ryobi 18-Volt ONE+ High Capacity LITHIUM+ battery provides four times more run time, 4 times longer lasting charge and 20% lighter weight than Ni-Cd batteries. The fuel gauge lets you know the battery status before work begins. Lithium-ion batteries provide fade-free power for maximum performance throughout the charge. 4 times the run time of 18-Volt nickel-cadmium (P-100) Improves the performance of 18-Volt ONE+ tools up to 35% On-board fuel gauge to check your charge before work begins Holds charge 4 times longer Compatible with all Ryobi 18-Volt ONE+ tools Charge only with 18-Volt ONE+ dual-chemistry chargers (not included) 20% lighter weight reduces user fatigue