Battery powered lawnmowers are a quiet, environmentally friendly and versatile alternative to traditional gas powered lawnmowers. Over time, depending on how much the battery is used and for how long it is charged, it will need to be replaced. Once you have acquired a replacement battery from the manufacturer, swapping the new one for the old one will only take a few simple tools and a couple of minutes; no need to call in a professional.
Locate and remove the fuse. Look on the left-hand side of the mower and pull the 40 amp fuse straight out; this will allow you to work on the machine without the risk of electric shock. Set it aside for later.
Pull upwards on the plastic grill on the top of the mower. Start with a corner, pulling the plastic tabs loose, and remove. Disconnect the terminal wire from the grill and set it aside. Take note of the location of the wires as you disconnect them to make reassembly easier. Mark it with tape if necessary.
Remove the battery shroud. There are four screws holding this shroud in place; use your screwdriver to remove the screws. Lift the shroud off and set it aside.
Unplug the four battery lead wires. Use a little masking tape to mark each set of wires on either side of the plastic harness where they are connected. This will help you to avoid connecting the wires incorrectly later.
Unscrew the four screws holding the battery bracket in place. Note the orientation of the bracket, which also houses the controller board; it will need to be replaced in the same orientation later.
Pull upwards on the battery, removing it from its housing. Set this battery aside and insert the replacement battery into the housing.
Reconnect the battery bracket using the screws you removed earlier. Reconnect the four terminal wires following the masking tape labels, and replace the battery shroud. Replace the terminal wire and grill in the reverse fashion as it was removed, pressing the grill against the mower until you hear the plastic clips pop into place.
Replace the 40 amp fuse. Plug in and charge up the mower following the instructions received with the replacement battery. It will then be ready to use.