Its possible that maybe your radio has been replaced? So the radio code that you have, might not be the correct one for the radio.
I would suggest pulling the radio out and getting the serial number off the radio, then just call a Mercedes dealer and they can get the correct radio code for you from the serial number.
The current through the battery is the flow of electric charge, measured in amperes (A), that is being supplied by the battery at a given moment.
chemical energy ... i guess
The amount of electrical energy supplied by the battery is measured in units called watt-hours (Wh). This value can vary depending on the capacity of the battery, which is typically listed in milliampere-hours (mAh) or watt-hours (Wh).
No. The power to illuminate the Daytime Running Lights (DRL's) is supplied by the alternator, and does not have to be supplied by the battery. Once a vehicle is started and the engine is running you could remove the battery from the car entirely and everything requiring current would still operate.
exploding battery?
No the battery is built in but should last a long time.
the battery on your meter has to be replaced.
Are you serious?
no
The computer only resets when the battery is removed. The alternator just charges the battery, so if the battery is left connected when the alternator is replaced, the computer should not reset.
A fuel cell is different from a battery cell in so far as reactants are constantly supplied to a fuel cell making it an open system whereas a battery cell is a closed system that stores the reactants within it. A fuel cell works as long as fuel is supplied to it whereas a battery cell requires regular replacements.
Disconnect battery cables from battery for 30 minutes and then reconnect battery it then resets.