Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 212.025 & 906.633
Mentioned: 3 Post(s)
Quoted: 32 Post(s)
If it really is no power, it should be easy to diagnose by measuring the battery voltage from the battery terminal directly (not from the wire clamp). Then forwards like towards the fuse boxes.
Modern MBs actually have a fuse on the main battery wire. It may not be even well documented (not in the car manual for sure) and may not be easy to find. It is a pyro-fuse, one that is blown off like in an accident to protect the car from short circuits that could ignite a fire.
If the battery connectors are bad, you should be careful with a charger, should use a good one. Perhaps your charger was not able to supply enough current without support from the battery (assuming the pyro-fuse hasn't blown, or does not exist on your car).