These Ryobi 18-Volt lithium-ion batteries have a built-in 4-bar illuminated charge indicator to warn of diminishing capacity. The Lithium+ compact stands up to frigid weather conditions down to 14°F (-10°C) and is engineered to run four times longer than a NiCd compact counterpart. Strap these packs onto any 18-Volt cordless product in the ONE+ lineup for supreme performance.