For users of the Ryobi 40V line of power tools and lawn equipment, the Ryobi OP40261 40V lithium-ion battery provides fade-free power and impressively long runtimes to all Ryobi Li-Ion compatible tools. This battery boasts a 2.6Ah capacity to run long enough o get the job done. Powering equipment with this Ryobi 40V is quieter and cleaner than gas-powered models and far more convenient than corded options. This battery features a fuel gauge, so users can keep track of how much battery life is left before a recharge becomes necessary. This battery charges quickly on the Ryobi OP0400 charger (sold separately).