This is a very compact unit that holds 6 batteries. It charges sequentially.
Very handy to store and transport all the batteries you need to work on projects.
Unlike the V18/V28 3 bay charger, it does not condition batteries. Since M18 Fuel 4 amp-hour batteries cost as much as a tool, an added conditioning feature would be handy (realizing the V18/V28 charger is $50 more).
When the NiCad batteries get charged the green light comes on, but with the Li-Ion batteries the battery will show 4 bars (full Charge)but the green light doesn't come on to show the battery is fully charged.