M18/M12 Vehicle Charger. Charge On The Go. The M18 & M12 Vehicle Charger allows users to charge battery packs on the go from the DC Outlet of any vehicle. The charger provides full system compatibility and accepts all M18 and M12 batteries. Featuring REDLINK? Intelligence, it communicates directly with the battery to monitor cell voltage, temperature, and charge status to optimize the performance and extend the life of the pack. As an added level of communication, the charger has protective electronics that automatically shut down the charger to prevent excessive discharge of the vehicle battery.