How to Install a Battery in a BMW
- 1). Open the trunk. Pull back the carpet on the floor, then lift up the base of the trunk by hand to reveal the battery.
- 2). Unbolt the battery tie-down from the floor of the trunk using the 3/8-inch ratchet and socket. Lift the tie-down off of the battery. Disconnect the negative terminal from the battery using an open-end wrench, then remove the positive terminal. Lift the battery out of the trunk.
- 3). Set the replacement battery into the trunk. Connect the positive terminal to the new battery using an open-end wrench, then connect the negative terminal.
- 4). Set the tie-down onto the replacement battery and bolt it down using the 3/8-inch ratchet and socket. Drop the trunk floor back down over the battery, then lay the carpet back onto the floor.
