⚠ Safety note: This guide involves working with electricity. If you're not completely sure about every step, stop and call a licensed professional. Before you start, always switch off the power at the breaker or close the main water/gas valve.
1 Prepare for safe work
Unplug the tool from the outlet or remove the battery, take off the work attachment, and wipe away any loose dust. Wear eye protection and check the manual for your specific model.
⚠ Warning: Don’t charge a swollen, cracked, wet, or overheated lithium battery. Move it away from flammable materials and take it to an authorized recycling center.
2 Check the outlet and charger
Test the outlet with another device and inspect the cable and contacts. Note the color and blinking pattern of the charger’s indicator light.
3 Clean and cool the contacts
Let a hot battery reach room temperature, and wipe the contacts clean with a dry cloth. Don’t short the battery terminals.
4 Compare with a compatible battery
If you have an original battery from the same platform, a comparison test tells you whether the charger or the battery is faulty.
? Tip: Take a photo of the initial state and change only one thing at a time. That way you’ll know which test actually solved the problem.
5 Reassemble, test, and set limits
Reassemble guards and attachments according to the manual and run a short test without load, then on scrap material. Strong vibration, sparks, smoke, or overheating mean you should shut off the tool immediately.
When to call a professional: If the job involves changes to the electrical panel, the main gas line, or load-bearing walls/beams — or if you're not sure how it will turn out — this is not a DIY task. Hire a licensed professional.