Oregon Cordless 40V C600 Lithium-Ion Battery Charger Charges any Oregon PowerNow 40V MAX lithium ion battery pack. Thermal and over-voltage protection circuitry prevents damage to battery packs and provides safe dependable charging. From a fully depleted condition, a Standard Battery should be ready for use in approximately 1 hour, approximately 2 hours for an Endurance Battery. Recharge at any time, battery pack charge maintenance not necessary to maintain consistent capacity. Fully charged battery voltage measured without a workload is 40 volts. Nominal voltage is 37.