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I need to remove my battery for an extended period and put it on a trickle charger, can someone tell me the size of the torx wrench needed to remove the battery clamp?
 

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Hi Lorn and welcome to the forum. If you add your location to your profile you will get better targeted replies. I suspect you are not based in the UK like me. My GLC 220d Sport does not have Torx screws securing the battery clamps, just a 13mm AF nut (1/2" AF which is 12.7mm is a snug fit but fits nonetheless). I popped off the engine cover, unclipped the pollen filter housing and had a look under the battery terminal cover. Perhaps petrol engined models have a different arrangement.

Because these cars have so many sensors and monitoring systems, I would just confirm with the dealer there will be no convoluted system reset procedure required once you reconnect the battery. I assume the car won't be stored in a place where the trickle charger could be connected up with the battery still in place. Anyway, here's a photo of my battery clamp arrangement.

 

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Best to ask your dealer for help or a trusted garage guy close to you. If need be, I've asked my garage buddy to come over once or twice to work on my cars.
 

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If anyone reads this (as it's the top result for googling GLC battery torx): it's a T40 torx screw holding the battery in the front near the middle (not on the right side like on older models like the GLK).
On my GLC, I had nothing to do after replacing the battery: no ESP error, no window controller to retrain, nothing. Even the clock came back on its own (either from the GPS or from the cell network connection).
 

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Just out of interest, when replacing a battery on these cars, does the new battery have to be registered to the car once installed?


Flapps
 
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