Accumulators; Accumulators, electric; Accumulators, electric, for vehicles; Batteries and battery chargers; Battery cases; Battery charge devices; Battery chargers; Battery power supplies for medical ventilators; Chargers for electric batteries; Charging appliances for rechargeable equipment; DC/AC power converters; Electric batteries for powering electric vehicles; Electrical storage batteries; Integrated battery backup systems comprising a battery, an electronic measurement apparatus for us...