Ryobi ONE+ 18V 2.5 Ah Li-ion Power tool battery. The powerful 2.5 Ah 18V Lithium+ Battery means that you can drive in more screws drill more holes & cut more using tools in the One+ range without recharging anywhere near as often. Its 4 Stage fuel gauge displays remaining power (100% 75% 50% 25%) so you always know how much power you have left. Intelli Cell™ technology further maximises runtimes & storage life with the pack design creating much better durability. Ideally suited to lighter-weight applications such as drilling & cutting