Originally Posted by
zip439
A load test is swell, but the way batteries are made these days I personally wouldn't trust one over two years in my car if I were having starting problems. I think low output on batteries is a major contributing cause to module failures on our cars and Mercedes in general. I just was shopping for a new battery and couldn't find much beyond a three year warranted. I have also seen loaded tested batteries fail shortly after reinstallation. To keep things simple when searching for a repair it makes sense to me to have a good battery.
If the battery was under two years I would load test it.
I think you are a bit confused, if a two year old battery was having trouble I would suspect the charging system before the battery. Also starter problems.
No crank would indicate to me a problem with the RCM, either poor soldering or a poor EC relay not the TC relay also starter system problems.
A decent code reader may give a hint. Guesses can get expensive and may solve nothing.