These instructions apply to the Mercedes GLC Mk1 (X253) 2015-2022. For other models, please choose your vehicle here.
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The Mercedes-Benz GLC (X253, 2015–2022) has a main 12 V battery plus a small auxiliary battery. This guide covers the main 12 V battery — the one you disconnect — and where to find it.
Where the Batteries Are
- The main 12 V battery is in the engine bay, under a cover (you may need to lift the cowl trim or engine cover to reach it). This is the one you disconnect.
- A small auxiliary ECO start/stop battery lives in the rear (boot/under the rear-seat area, driver’s side) — it’s a separate, low-current battery you don’t normally touch.
- On the plug-in hybrid GLC, keep clear of the orange high-voltage components.
Disconnecting the Main Battery
- Switch everything off, take the keyless remote out of range, and wait a minute.
- Disconnect the negative (−) earth first and tuck the lead clear.
- If removing the battery, disconnect the positive (+) next, then the clamp.
Reconnecting & After
- Reconnect positive (+) first, then the negative (−) last.
- Reset the clock; the displays reload on their own.
- Re-initialise the windows and, if fitted, the sunroof — see our GLC window guide.
- A new battery should be registered to the power-management system with a diagnostic tool.
Frequently Asked Questions
Where is the battery on a Mercedes GLC X253?
The main 12 V battery is in the engine bay; a small auxiliary battery sits in the rear.
Does a new GLC battery need coding?
Yes — a new main battery should be registered with a tool; a quick disconnect/reconnect of the same battery doesn’t.
Why disconnect negative first?
It removes the earth path so a tool touching bodywork can’t short the battery.
Do I need to touch the auxiliary battery?
No — for normal disconnection you only deal with the main 12 V battery under the bonnet.
For any warning light that stays on, look up the code on autodtcs.com. To clear the service reminder, see our GLC service reset.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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