Power Tool Lights
Milwaukee Charger Red and Green Flashing: What It Means and What To Do
Quick answer: Red and green flashing lights on a Milwaukee charger usually indicate a battery or charger status code that needs to be checked against the charger manual.
What this light usually means
Red and green flashing lights on a Milwaukee charger usually indicate a battery or charger status code that needs to be checked against the charger manual. The exact meaning can depend on the device model, the label beside the light, and whether the light is solid, blinking, flashing, pulsing, or alternating with another color.
Common causes
- Battery is not charging normally
- Battery pack may be defective
- Battery temperature issue
- Battery not seated correctly
- Charger or battery mismatch
What to check first
- Remove and reseat the battery.
- Check the charger manual for the exact red/green pattern.
- Let the battery reach room temperature.
- Try another compatible battery to isolate the issue.
- Stop using the battery if it is damaged or overheating.
Important warning
Alternating charger lights are often diagnostic codes. Do not ignore repeated fault patterns.
When it may be normal
This light may be normal if the device recently powered on, is pairing, is charging, is updating, is connecting, or is completing a setup step. If the light changes after a few minutes and the device works normally, it may not require further action.
When to contact support
Contact the manufacturer or a qualified professional if the light stays on after basic checks, appears with warning sounds, appears with heat or burning smells, affects a safety device, or comes back repeatedly after restarting.
Official sources
Use these official support resources to confirm the exact meaning for your model:
Related light guides
DeWalt Charger Flashing Red Light
A flashing red light on a DeWalt charger commonly means the battery is charging, but different flash patterns can also indicate hot/cold delay or a battery problem.
Power Tool Lights · DeWalt
Ryobi Charger Flashing Red Light
A flashing red light on a Ryobi charger can mean charging, temperature delay, or a fault depending on the charger model and flash pattern.
Power Tool Lights · Ryobi
FAQ
What does a red and green alternating or flashing light usually mean?
Red and green flashing lights on a Milwaukee charger usually indicate a battery or charger status code that needs to be checked against the charger manual.
Should I reset the device right away?
Usually no. Start with simple checks such as waiting, checking power, checking cables, restarting normally, and reading the official manual before doing a factory reset.
Does the exact model matter?
Yes. Brands often use the same light color for different meanings across different models, so always confirm with the official manual or support page for your exact device.
Last reviewed: 2026-05-05. General information only. Always follow the official manual for your exact model.