28-Volt Charger. Power up V28 and M28 Lithium-Ion batteries in less than one hour. Milwaukee’s 28-Volt Charger quickly charges V28 and M28 Lithium-Ion batteries for less downtime on the job. The high-visibility LED light displays the charge status from across the room so you can monitor recharges without interrupting your work. The units pass-through plug conserves valuable outlet space. Get single-charger simplicity when working with all of your V28 and M28 cordless power tools.