Charges 40V Batteries in 1-Hor or Less on Average Indicator Lights Show Charging Status and If the Battery Is Too Hot or Too Cold Over 50+ 40V Tools – All Work With Any RYOBI 40V Battery RYOBI introduces the 40-Volt Lithium-Ion Rapid Charger. On average, this charger charges 40V batteries in 1-hour or less. The indicator lights provide the battery charging status and even lets you know if the battery is too hot or too cold to charge. Compatible with all RYOBI 40-Volt batteries and featuring innovative charging technology, this charger is designed to protect and extend the life of your batteries. Spend less time waiting on a charge, and more time tackeling your yard.