How to Change the Battery in a Lawn Mower

All gas-powered lawn mowers run on gasoline, oil, and batteries, and knowing how to change your lawnmower’s battery yourself can save time and money. However, a difference from many battery-powered devices, lawnmower batteries are very specific to the model and type of lawnmower. Make sure you get the correct type and follow these steps to replace the old one.

Step 1 – Find the battery

The mower batteries are located in one of two places: under the hood or under the mower seat. To find it, turn off your mower and remove the keys. Look in both places and then find and release the cover latch so you can access the battery. Remove any strap or tie rod holding the battery in place.


Step 2 – Remove the battery cables

Every time you remove a battery, comment on removing the black or ground wire. If the connectors are corroded, use a stiff wire brush to clean them. If the battery is badly corroded, use baking soda and water paste and apply it to the terminals. Allow it to sit for a few minutes before using the brush and clean water to rinse off the corrosion. Dry the water with a soft cloth. Be careful not to get the mixture or water into the battery cells and rinse well before removing. Baking soda neutralizes battery acid and neutralizes the battery if it enters cells.

If the connectors remain tight, use a flat-head screwdriver to slowly pry the connector apart and away from the terminal. Do not force the cable, you can already remove the connection terminal. Once the negative wire (black with negative sign on terminal) is removed, remove the red wire (positive with plus sign on terminal).

Step 3 – Replace the battery

Once you remove the battery from the holder, clean (rinse) any corrosion or dirt and sequence the holder. If the bracket is metal and shows signs of rust, sand and sharpen the rust spots as battery fumes can accelerate rust.

Place the new battery in the holder and attach the strap or tie bar. When reconnecting the cables to the battery terminals, always communicate with the positive (red) cable. Connect it to the positive terminal and tighten the bolt to secure it. Follow this by connecting the negative (black) wire to its respective terminal as well.

Replace the battery cover and test it to place that everything works.

Tips for replacing a lawnmower battery

Not all batteries are the same, so, as mentioned above, make sure you get the right battery for your specific lawnmower model and type. Also, check your battery for corrosion at least once a month and read your owner’s manual so that the battery is properly charged and maintained.

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