Can Milwaukee charger charge 2 batteries at once?
Milwaukee’s Multi-Voltage Charger handles both 12- and 18-volt batteries at the same time.
Can Milwaukee batteries be left on the charger?
No battery pack damage will occur, however, if the charger and battery pack are left plugged in. 12V and 18 V Li-Ion batteries in the 12 and 18 V Li-Ion Combo Charger. Other types of batteries may cause personal injury and damage.

Can a Milwaukee charger charge a M12 and M18 at the same time?
The M18™ & M12™ Multi-Voltage Charger accepts all M18™ and M12™ batteries, so you’ll always be prepared and productive, especially on jobs that require a mix of M12 and M18 Milwaukee cordless power tools. This versatile unit charges batteries sequentially, reducing your time to manage charge cycles.
Can you charge a Milwaukee battery with a DeWalt charger?
The answer looks like yes! Simply take a multitool or some snips and trim the lip off the dewalt battery. it should now slide onto the drill. yes this means that Dewalt fanboys can go ahead and buy the milwaukee cordless heat gun and not have to shell out for the batteries and charger, YAY!
Are Milwaukee batteries OK in the cold?
MILWAUKEE® Lithium-Ion battery packs are designed to operate in temperatures below freezing. When the battery pack is too cold, it may need to warm up before normal use. Put the battery on a tool and use the tool in a light application. It may “buzz” for a short time until it warms up.

How do you tell how many times a Milwaukee battery has been charged?
Use the Fuel Gauge to determine the battery pack’s remaining run time. Press the Fuel Gauge button to display the lights. The Fuel Gauge light(s) will stay lit for two seconds. NOTE: If the Fuel Gauge doesn’t appear to be working, place the battery pack on the charger and charge as needed.
Why is my Milwaukee charger blinking red and green?
Battery Pack is OK – Good. if RED and GREEN LED’s once again begin to flash simultaneously the battery pack is damaged or faulty and will need to be replaced. Remove the battery pack from the Charger and unplug the Charger from the 120VAC power source – required to reset Charger PCB circuitry.