Uses a microprocessor-controlled charging system, constant current and constant potential charging. No adjustment required. LED colored lights indicate state of battery charge, with charge time depending on the state of battery discharge. For instance, an Ultralight cap lamp without remote adapter that has been used for ten hours will charge completely in less than ten hours. When the battery is fully charged, it automatically goes into "sleep mode." The PowerBuilder charges all MSA batteries (old or new) and also competitive lead acid batteries. All chargers can be used as a tabletop or wall mount. The DC version of the single-unit charger can be plugged into an automotive-type cigarette lighter. The five- and ten-unit chargers can be internally set for 110- or 220-volt operation. Can be used tabletop, wall-mounted, or stacked on a leg assembly. The leg assembly kit enables up to six of the ten-unit chargers to be stacked. This can total up to 60 stations, with 30 stations on each side of the rack (back-to-back). The five-unit charger can be converted into a ten-unit charger. The PowerBuilder charger for cap lamp batteries allows for the extended use of the 16-ampere-hour Luminator® Plus battery and still has enough charging capability to bring the battery back to charge for the next work shift.