How to Charge a Riding Lawn Mower Battery With a Car

Riding lawn mowers have a construction similar to that of automobiles: a gas-powered motor that has a battery-powered electric ignition. Like a car, if this battery dies, you cannot start the engine. However, you can charge or "jump-start" a lawn mower battery just as you can a car battery.

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Riding lawn mowers generally have battery-dependent electric ignitions.

Step 1

Locate the negative terminal on the lawnmower battery. Terminals are the places on the batteries where the cables connect. The negative terminal is black and usually has a "minus" (-) sign by it, while the positive terminal is red and has a "plus" (+) sign by it. Disconnect the negative contact on the lawn mower battery. This may require a screwdriver or pliers, depending on the model. Do not let the cable touch anything.

Step 2

Connect the lawn mower battery and car battery with your jumper cables. Connect a positive (red) clamp to the positive lawn mower battery terminal. To open a jumper cable clamp, squeeze it as you would with scissors or tongs. Springs in them will make them latch on to the battery terminals. Connect a positive clamp to the positive car battery terminal. Connect a negative clamp to the negative (black) lawn mower battery terminal. Connect a negative clamp to the frame of the car.

Step 3

Turn the car on, but keep it in neutral. Press the accelerator pedal. Let it run at around 2000 RPM for about two minutes.

Step 4

Disconnect the jumper cables. Replace the negative battery contact on the lawn mower. Start the lawn mower.