Battery dead or not?

Paintboy

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Joined
Mar 22, 2022
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Your Mercedes
E class coupé
Hi, my usual garage attempted to fit a new battery. Car is a 2011 e class diesel coupe. It's not a top spec battery but it's like for like amps etc, and it's stop/start.
Cost £145
So when they put it on, no dash lights or anything came on, let alone turn it over
So they refitted the old one, hey presto all working.
Any ideas? Battery seller is adamant it's not the battery. It reads 12.89v at present sitting in my workshop
 

Avantgarde Automotive, Mercedes-Benz and SLR McLaren specialists. Service, repairs, diagnosis and motorsport preparation.
Unit 14 Hither Green Trading Estate, Clevedon, Somerset, BS21 6XU Tel: 01275 217270 Email:steve@avantgarde-automotive.co.uk
www.avantgarde-automotive.co.uk
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