If you?re on a job that requires either 12 or 18 Volt batteries from Milwaukee, this 48-59-1812 charger is what you need to keep your tools working properly. It can charge in as little as a half hour. It has an electronic communication system that monitors how much the batteries have charged. If they?re fully charged or overheating, it will drop the amount of energy expended, keeping your equipment safe and your energy costs down. To help you get a sense of where your charge is, a set of LED lights on the side of the unit indicate whether the unit is fully charged or not. Plug in both your 18 and 12 volt batteries in this Milwaukee charger to see just how much time you can save on the jobsite so you can get your job done. Item is shipped in bulk packaging. DUAL CHARGING: This charger can tackle both 18 and 12 volt Milwaukee batteries, holding one of each in the unit at the same time. SEQUENTIAL CHARGING: Do not worry about managing charge cycles. This will take care of your batteries one at a time, devoting full charging power to each one. BATTERY COMMUNICATION: The charger has a chip that communicates with its batteries, keeping track of how much they have charged. It saves you power by reducing the amount of charge produced as the battery reaches full charge. FAST ACTING: Compact batteries can be fully charged in as little as 30 minutes, while extended life batteries can be charged in as little as a single hour. INDICATOR LIGHTS let you know whether a battery is charging, fully charged, and whether it needs maintenance or not.