Can a dead battery on an E Class be recharged or is replacement the only option?

[howardprescott]

I'm trying to figure out if I'm throwing money away here. My 2016 E350 sat for about five weeks while I was out of the country, and when I came back the battery was completely flat – not even enough power to pop the trunk. I hooked up a smart charger I borrowed from a friend and let it charge for about 24 hours. The charger said "full" but when I tried to start the car, it cranked slowly a couple times then went back to clicking. Does that mean the battery is damaged beyond repair? A mechanic told me that Mercedes batteries don't like being fully discharged and once they go below a certain voltage, the internal chemistry gets messed up and they'll never hold a full charge again. But another guy said I just need a more powerful charger to "desulfate" the battery. I'm confused. I've been searching for Mercedes Benz Battery Repair Dubai and it seems like most places just replace rather than repair. Has anyone successfully brought a deeply discharged Mercedes battery back to life? Or am I just delaying the inevitable and should just buy a new one? Trying not to spend money I don't need to, but also don't want to get stranded somewhere.