Riding lawn mowers use batteries for a variety of functions but primarily for starting. Other functions for the battery are any electronic controls on the mower and lighting. If proper actions are not taken during storage of your mower, the battery can become drained. Then the lawn mower will not start, and the battery will have to be recharged or replaced. Here's how to stop a battery from draining while not in use.
Turn off all lights and other electronic devices when the mower is not in use.
Replace the battery before the recommended replacement date as all batteries lose power over time. As the battery ages, it proves more difficult to regain or retain a charge.
Use the adjustable wrench to remove battery cables from the terminals if the lawn mower is going to be stored for a long time. Even with nothing turned on, the cables draw small amounts of power from the battery. If the cables are left connected during a long storage period, you may encounter a dead battery when trying to start the mower.