Milwaukee M12 12-Volt Lithium-Ion Battery Charger (48-59-2401) Single unit simplicity: Charges M12 RED LITHIUM and M12 Lithium-Ion batteries Charge management: Charger communicates with the battery pack to ensure a full charge and battery protection Onboard indicator light: Provides the status of the battery Pass-through plug: Conserves valuable outlet space In easy-to-open bulk packaging to pass the savings on to you