Ryobi RB18L40 18V Lithium+ Battery (1x4.0Ah)Features * Powerful 4.0Ah Lithium+ battery gives more power longer runtimes and better durability than previous lithium technologies. * 4 Stage fuel gauge displays remaining power (100% 75% 50% 25%) * IntelliCell™ technology monitors and balances individual cells to maximise run-times storage life and safety * Tough pack design with built in impact protection for long term durability * Drive up to 1391 4x40mm screws with RCD1802 * Cross-cut up to 294 pine 2x4's with RWSL1801 * Drill up to 234 6mm holes 40mm deep into brick with LLCDI1802 * Runtime can vary by tool battery and application