Worx Lawn Mower Battery Not Charging? (Possible Causes & Fixes)

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by Upgraded Home Team
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worx lawn mower battery not charging possible causes fixes

A dead battery can put a damper on grass cutting. With the Worx lawnmower comes a 24-volt lead-acid battery that may need charging. Batteries may weaken or die for several reasons, and it is best always to be prepared with a charger.

You may hook it up and let it charge for the recommended time frame and see if it will start. However, there are times it may not charge. So, what do you do when the Worx lawnmower battery is not charging?

When the Worx lawnmower battery is not charging, you can troubleshoot down the list by starting with the connections. 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.

Troubleshooting the Problem With A Dead Battery Not Charging

When it comes to a dead battery not charging on a Worx mower, it is all electrical. Everything that deals with the battery comes with wires and the electrical system. Going down a checklist starting with the battery and charger will give an idea of the problem and fix it.

Here are some helpful tips on what to look for with each component to determine why the battery is not charging.

Step 1. Check the Volts in the 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.

Also, be sure to check the connections at the terminals. Loose connections will make it seem like the battery is dead or weak.

Step 2. 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 3. 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 battery. This will cause the battery to drain quickly.

The way 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.

If that does not do the trick to get the proper RPM, then move to the governor. Adjust it to rev the engine and gain the desired speed. You can use an RPM tester and go off the owner’s manual to find the accurate readings.

Step 4. 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 5. Checking the Charge Lead or the Battery Ground

If corrosion is visible around the positive or negative connections, this could prevent a charge. Taking a wire brush to the connections will clean off the corrosion and allow for a better connection. It is critical to wear safety glasses and gloves when doing this.

Here is a special tip to follow if the corrosion is overwhelming. You can use baking soda and water to make a paste and clean it off. Also, try pouring Coca-Cola over the terminals as it will neutralize the acid.

Whichever you choose, make sure the coke or the baking soda paste does not get inside the battery cells. Rinse off the connections with distilled water and dry thoroughly before reconnecting the wires.

If there is heavy corrosion, it is a sign the battery is going out. You may decide to go ahead and replace the battery with a new one.

Step 6. Wires or Output Connector

Some wires may be shorted out and touching. Some may be exposed or grounded and may be in between the output connector and the battery. The wires will need repairing immediately and remain insulated.

Any debris or moisture getting inside the exposed wires will cut the electrical current. When this happens, it can fry the components or discharge the battery over an extended period.

Step 7. The Diode May Be an Issue

A diode acts as a gateway letting the electricity flow one way. The rectifier consists of diodes that convert AC power to DC power. Diodes are what are used to charge the battery and operate other electrical components like the headlights.

If the battery is still not charging, a diode has lost connection or went out by this troubleshooting step. A multimeter can test the diode’s health, and you may find it was installed backward. If this is the case, it will not work correctly or charge the battery.

If for any reason you ever removed the diode, or you know someone did, double-check it. It could be the reason you are having problems charging the battery. If it is on backward, uninstall it and put it back the proper way.

Step 8. The Ground or the Regulator Rectifier

The regulator rectifier switches AC power to DC power while regulating the current sent to the battery. It ensures the current is balanced and stops surges. There is also a ground circuit protecting the battery from overcharging.

If the rectifier fails or the ground wire gets disconnected, the battery will not charge due to no power flowing. A bad battery will give off the sign of a failing regulator rectifier. A multimeter will give you a definite answer if the regulator rectifier is faulty.

Step 9. The Alternator Magnet May Have Worn Out

Over time alternators will give out due to wear and tear. They will no longer be able to generate a current. An alternator works by using a rotor and magnets attached and spinning within a stationary armature.

Electrical currents are created inside the armature while the opposite ends of the magnets are spinning. It is then sent to the rectifier so that it can get converted to DC power. From there, it is sent with a continuous output as it charges the battery.

If the connections or the rotor get damaged inside the alternator, it will no longer generate currents. A multimeter can test the alternator to see if the component is still operable.

How to Charge a Worx Lawnmower Battery

Charging a Worx lawnmower battery is no different from any other name brand.

Step 1: Make Sure the Charger is Not Plugged

Be sure there is no power going to the charger when connecting to the battery.

Step 2: Wear Gloves and Glasses

Safety is always first. Sparks and debris can fly. Accidents can happen, so put on safety glasses and gloves.

Step 3: Remove the Spark Plug Wire and Spark Plug

This goes under safety. By removing the spark plug, you are eliminating anyone starting the mower. It is an added step to keep you safe as well.

Step 4: Positive to Positive

Connect the positive cable from the charger to the positive terminal on the battery. The battery can remain hooked up to the mower while charging.

Step 5: Negative to Negative

Connect the negative cable from the charger to the negative terminal on the battery.

Step 6: Charging the Battery

Plug in the charger and charge the battery for five to seven hours.

Step 7: Remove Everything

When the green light comes on, the battery is charged. Unplug the charger and remove the cables.

Step 8: Test the Mower

Put the spark plug and the spark plug wire back on and test the mower. It should crank.

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