This small battery is for the sbc braking system. Your car uses a electronic brake pump. The battery is their for a back up electricity supply just in case there is catistrofic failure of main battery or power supply to the sbc pump.
My mechanic told me it helps start your car.
under the hood. top left
Waiting for the answer.
on the front and back.
Check under the back seat.
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Battery is under Rear passenger seat.
On my 1998 E320 fuses are left of the instrument panel facing the door, under the rear seat next to the battery and under the hood.
Cr2025
The battery in the keyless remote of a 1999 Mercedes E320 is changed by prying off the back cover and lifting the battery out. The battery will typically last 2 years or more under normal use.