2-Pack RYOBI ONE+ 18V LITHIUM+ HP 9.0 Ah High Capacity Battery

Built-in 4-bar illuminated charge indicator to warn of diminishing charge
Stands up to frigid weather conditions
Lithium-ion chemical composition resists drainage when idle
Recharge on any 18V ONE+ Dual Chemistry Charger
Easily snaps into place and detaches with quick-release button
Lightweight composition results in less user fatigue
Fade-free power for maximum performance
Battery delivers superior runtime, power, and performance