If you have just got yourself a nice, new, shiny Milwaukee tool and have just plugged the battery in to charge you may be a little confused by all the different lights on the charger. What do the light on a Milwaukee charger mean? And which ones should you worry about?

Symbols on the Milwaukee Charger
Symbols on the Milwaukee Charger

So here is the index for the Milwaukee that is printed on the charger itself. let’s have a quick rundown of all the symbols before we jump into more detail.

So from the top left, one red solid red light means charging. A flashing red light means the battery is either too hot or too cold. The sand timer relates to having two batteries in the charger at the same time. The full green light means the battery is fully charged and finally flashing red and green lights means there is a problem with the battery and it should be removed.

Solid Red Light – Charging

One Red Light - Charging
One Red Light – Charging

The single solid red light is displayed above the battery that is being charged. If we were charging a 12v battery on the left-hand side it would be the left led light up red.

The Battery Lights Show Charge Level
The Battery Lights Show Charge Level

One thing the Milwaukee charger and battery do which I really like is that the charge % is shown on the battery while it is in the charger.

Other brands may do this but I can’t say I have seen it yet on any other brand I have used.

Solid Green Light – Fully Charged

One Green light - Fully Charged
One Green light – Fully Charged

When the LED turns into a solid green light then the battery is fully charged. The charge % indicator on the battery will also switch off when fully charged.

Flashing Red Light

This means that the battery is either too hot or too cold. The battery needs to be between 0°C and 65°C in order to charge. If it is outside of this then you can leave the battery on the charge to either heat up or cool down and then it will start charging.

Flashing Red & Green

This is the battery error indicator. You can try to remove the battery and re-seat it and see if this fixes the error. If not you should remove the battery from the charger before it causes any damage and either dispose of it or get it looked at.

Slow Blinking Red Light With Two Batteries In

You can have two batteries in this charger at the same time. You can have a 12V/14V battery in and an 18V battery.

When this is the case only one battery will be charged at a time. The second battery will only start charging once the one that was inserted first has fully charged. When this is happening the light above the battery that is not being charged will slowly blink red.

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Author

Wood by name, wood by nature. I am a fully qualified, time-served, award-winning joiner with an NVQ Level 3 in Carpentry and Joinery as well as an HNC in Construction. Beyond my joinery qualifications, I have also earned a degree in building surveying. I believe these qualifications make me perfectly positioned to provide expert advice on many different areas of DIY as well as share all of the tips I have picked up in over a decade working on building sites!

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