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 2 most common part(s) or condition(s) which cause the symptom Lawn mower battery keeps draining are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 2994088
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.