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RYOBI introduces the 18-Volt ONE+ Lithium-Ion Battery Pack 4.0 Ah (2-Pack). These batteries feature superior electronics and performance to allow you to work stronger and longer with all 18-Volt ONE+ tools. These batteries deliver superior runtime, power and performance when paired with RYOBI Brushless tools. They have a durably constructed frame for impact protection and have an on-board fuel gauge so you can easily check your charge at any time. These batteries can be paired with over 125+ tools from RYOBI 18-Volt ONE+ lineup. Best of all, it's a part of the the RYOBI ONE+ World's Largest 18-Volt Tool System*. Backed by the RYOBI 3-Year Manufacturer's Warranty, this battery pack includes two 18-Volt ONE+ 4.0 Ah Batteries and an operator's manual. Charger sold separately.