Does a Low Battery Impact Lawn Mower Performance?

Battery Functions

• The battery on a riding mower supports additional functions such as lights and dashboard indicators. Batteries also power the blade controls on riding mowers, zero-turn mowers and lawn tractors. For mowers with a separate starter, the battery energizes it for the initial start and delivers power during the start cycle. As such, a battery with intermittent or low charging properties can impact a mower’s performance.

Dead Battery

• Your battery might have exceeded its lifespan if it doesn’t work properly. Over time, the battery’s cells will naturally lose their ability to hold a charge. Check your battery’s warranty for specific lifespan details. If your battery is relatively new or is within warranty, test it for resistance and charge capacity. If you don’t have testing equipment, take it to a car service center or automotive store. Both usually offer battery testing service.

Electrical System

• A weakened electrical and ignition system can lower your battery’s charge capacity, thus lowering your mower’s performance. Inspect all connecting wires for obvious damage such as arcing or tears. The battery posts and terminals should be free of corrosion. Clean them with a stiff wire brush and baking soda. Also check the voltage regulator or rectifier to see if it’s defective. The regulator controls the amount of voltage that's sent to the battery for power.

Discharge

• Batteries require consistent voltage delivery to remain charged during mower operation. If your mower is constantly running at low revolutions per minute or at idle, the engine can’t generate enough voltage to negate the battery’s dispersing charge. Batteries will also disperse a charge when you aren’t operating your mower. Refrain from lengthy idle periods. It's also best to disconnect your battery from the mower's engine before storage or if you're not using the mower for more than a few days.