During the off-season, the battery can lose its charge. Charge the battery fully before storing your tractor for the winter. You may also need to charge the battery again before starting the tractor in the spring.
Replace the battery if it won't charge. If you charge the battery with an external charger but the battery drains when you're running the tractor, then the engine's alternator could be the problem. The alternator recharges the battery and powers the tractor while the engine runs. To check whether the alternator's charging the battery, use a multimeter to measure the DC voltage at the battery with the engine running. You should measure between 13 and 14 volts. If not, then you may need to replace the alternator.
When your mower's battery is dead and you need to mow right away, use the tips in our video to safely jump-start the mower.