You could troubleshoot down the list by starting with the connections when the Worx lawnmower battery is not charging. Loose connections will not allow the battery to charge correctly. Testing the battery, RPM, fuses, charge lead or ground, output connector, diode, regulator rectifier, or alternator magnet will solve much.
Complete Instructions for Troubleshooting the Problem With Power Tools Battery Not Charging
Step 1. Check the Battery Charger
The battery charger may not be doing its job. This is the next thing to look into when troubleshooting. If the charger is old, it may have done its time.
The outlet the charger is plugged into may be an issue as well. If there is not enough power to run the charger effectively, the battery will not charge. Continue down the list if the battery and the charger are showing signs they are still good.
Step 2. Check the Volts in the Worx WA3551.1 Tool Battery
The battery is the source of the electrical system, so, logically, that is where to begin. As the engine runs, the battery should charge. If there is no charge or the battery drains quickly, it is a sign the battery is failing.
The way to tell if a battery is bad is to use a multimeter to test the voltage. If the meter reads 11.5 volts or less, the battery is no good. Replacing the battery would be recommended. And be sure to check the connections at the terminals. Loose connections will make it seem like the battery is dead or weak.
Step 3. Check the Fuses
All electrical equipment, whether mechanical or electrical, has fuses. It is possible a fuse may have blown. This little device can shut down the entire electrical system.
Check the owner’s manual to find where the fuse is located. Pull it out and look to see if the metal inside is cracked or look for burnt traces. If this is visible, change the fuse as they go out over an extended time frame.
Step 4. The RPM May Be Too Low
With the charging system on the mower, it requires an average RPM to function fully. If the RPM is too low, the charging system will not charge the Worx cordless drill battery. This will cause the battery to drain quickly.
To fix the RPM is by adjusting the throttle or governor cable. This will raise the RPM and get the charging system in check. Start with the throttle first to gain more air while the engine is idling.