Your mower’s battery might not be something you think about often — until your machine refuses to start, or the blades stall mid-cut. Whether you have a ride-on mower, a zero-turn beast, or a compact electric push model, knowing a few key things about lawn mower batteries can save you frustration, money, and time.
Different mowers use different batteries. Traditional ride-on mowers often use 12V lead-acid batteries similar to small car batteries. Modern electric mowers, however, might use 36V, 48V, or even lithium packs with specialized battery management systems (BMS). Always check your owner’s manual for specs.
If you have a gas-powered ride-on mower, the Cold Cranking Amps (CCA) rating is important. It indicates how well the battery can deliver current to start the engine, especially on chilly mornings. For most mowers, 230-350 CCA is common.
Most mowers with gas engines need starter-style batteries (quick bursts of power). Electric riding mowers and robotic models generally use deep cycle batteries designed to slowly discharge over hours. Using the wrong type shortens lifespan.
Newer lithium-ion (LiFePO₄) batteries weigh half as much, charge faster, and last 5x longer than traditional flooded lead-acid batteries. Although more expensive upfront, they pay off over time — fewer replacements and consistent power until fully discharged.
Grass clippings, dirt, and corrosion can disrupt connections. Once a month, wipe the battery top with a damp cloth and ensure terminals are snug. A dab of dielectric grease prevents rust.
Extreme heat speeds up internal chemical reactions, shortening battery life. Cold slows reactions, reducing starting power. Store batteries indoors in winter and avoid leaving lithium mowers in direct sun all day.
For lead-acid: Charge after every use. Never leave it discharged for weeks.
For lithium: Many models have smart chargers. Keep between 20%-80% if storing long-term.
Before winter:
Clean the battery.
Fully charge (or around 50% for lithium).
Disconnect it from the mower.
Store in a dry, cool spot.
Engine cranks slowly or not at all.
Lights dim or flicker.
The battery needs frequent charging.
Visible swelling or corrosion.
Most mower batteries last 3–5 years for lead-acid, and 6–10 years for lithium.
When replacing, ensure the new battery matches:
Voltage (12V, 24V, etc.)
CCA rating (for starters)
Terminal layout
Chemistry (especially for mowers designed for lithium)
A slightly higher capacity (Ah) can give you longer run times.
A healthy battery is the heart of your mower. Knowing how to choose, maintain, and store it means fewer headaches and beautifully cut lawns all season.
