The lawn mower small engine often has a separate model number. Use the small engine model number for a complete list of symptoms and parts. Watch our model # lookup video for help finding the model number.
The 4 most common part(s) or condition(s) which contribute to the symptom Lawn mower battery keeps draining are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.
For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.
If the battery keeps draining and won't hold a charge one or more cells in the battery might be dead. Try charging the battery with a battery charger. If it won't hold a charge the battery will have to be replaced.
If the battery keeps draining the charger might not be working properly. The charger's electrical output can be checked with a volt meter. Also, check the outlet that the charger is plugged into. Many garage electrical outlets are protected by a GFCI breaker that might have tripped. If he charger is working properly the battery itself might be defective.
The alternator provides power to the lawn mower while the engine is running. It also serves to recharge the battery. If the battery keeps draining the alternator might be defective. If the lawn mower has headlights, try turning on the lights and watch them while turning off the engine. If the lights dim after turning off the engine the alternator was working. If not, the alternator is probably defective.
If the lawn mower battery keeps draining and won't hold a charge the voltage regulator might be defective.