This Ryobi OP404 40V lithium-ion battery charger can rapidly power up a dead battery, so users can spend more time working and less time waiting for a charge. An onboard status indicator monitors batteries as they charge, preventing damage and conserving energy at the same time. LED lights communicate to the user when batteries are charging, fully charged, and defective. Use this OP404 rapid charger to recharge Ryobi 40V li-ion battery models such as the included OP40401. Delivering reliable, fade-free power to Ryobi 40V cordless tools, this OP40401 lithium-ion battery is certain to impress. Lithium-ion technology ensures that this battery runs longer and weighs less than comparable NiCD batteries. Plug this 4.0Ah heavy duty battery pack into any of Ryobi’s 40V outdoor power tools (sold separately) and get the job done with the same rugged performance of a gas-powered unit. The OP40401 boasts 4.0Ah of power, making it the perfect choice for extended tasks or power-hungry tools. This OP40401 lithium-ion battery works with Ryobi 40V cordless power tools such as RY40406, RY40540, RY40530, RY40620, RY40250, and more (sold separately). Note: The OP404 charger requires 120V, 60Hz input power and uses the standard two-prong North American plug.