The Ametek Accu-Charger sets the industry standard for accuracy, efficiency, flexibility and reliability. Designed to recharge any 100% discharged lead-acid battery in its ampere-hour rating within 8 hours, the Accu-Charger is engineered to provide the maximum in charging performance. The charger uses ferroresonant power conversion circuitry, which is virtually maintenance-free, to provide years of dependable service. The power conversion circuitry maximizes battery life by using a constantly tapering charge which is automatically regulated by the “On Charge” battery voltage. The output current of the Accu-Charger is determined by the state of discharge of the battery. The battery is precisely charged, based on its depth of discharge.