GLB Battery Removal - MBWorld.org Forums

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Odd Piggy

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2021 GLB250 FWD, 2023 GLA250 FWD

GLB Battery Removal

The battery is under the cover with the jump start positive connection. Pull toward you with the 3 semicircular finger grips.

After removing the cover use a 10mm socket to loosen and remove the battery negative (ground) cable.

Move to the fromt of the battery box and unclip the large connector. It has a locking clip that frees it.

Next remove the battery vapor purge hose through the hole in the center of the front of the battery box.

Use an E10 (female} Torx on a long extension to loosen front of the battery box, which covers the positive battery cable connections.

Move the large connector out of harm's way. Then completely remove the front of the battery box. Do not worry about dropping the hold down screw because it stays securely in the hole.

Remove and keep the red positive terminal cover to use on the new battery.

Use a 13mm socket to remove the positive cable from the stud on the positive connector. There is another 13mm nut connecting the BCM (the black box sitting on top of the battery) to a buss bar that can be removed at this time.

Now unclip the terminal on the BCM which is on top of the battery.Pull up the white tab to release the connector.

Now remove the positive battery terminal and the connecter BCM from the top of the battery.

Next use a 6mm socket to remove the nut that holds down the front of the pre-fuse box. Pull up the box and move it out of the way.

Firmly grab the left side of the battery box, wiggle and pull har to remove it. There are no clips, it is held in by friction.

The battery left side hold down can be removed with a 13mm deep socket. The deep socket is needed because the stud is too long for a standard socket to work.

The battery hold down strap is connected to th left hold down. Move them out of the way and lift the battery from the box raising the front end first. Reverse these steps to install the new battery.

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