RYOBI introduces the 18V ONE+ Lithium-Ion 4.0 Ah Battery (2-Pack). These RYOBI ONE+ 18V Lithium-Ion 4.0 Ah Batteries provides up to 3X more runtime compared to our 1.5 Ah standard lithium-ion battery. It features professional grade lithium-ion cells to provide fade free, cord-like power. It performs in extreme weather temperatures and is engineered to be impact resistant. This battery also features an integrated LED fuel gauge to check your battery charge at all times. Backed by the RYOBI 3-Year Manufacturer's Warranty, these batteries include an operator's manual. Charger sold separately.