On a RR, the battery slowly loses charge. I'm struggling to understand if it's the battery (which has tested fine) or the charging.
Initially I was puzzled because it mainly discharged on longer trips (over 250 miles and it would start to fail) yet on short frequent runs it seemed to be charging and holding charge fine.
I had to charge it overnight with a 4 amp charger and next day it would be OK - this was done weekly. A week of short trips and it needed some help, but one long trip and it was struggling.
I'm prepared to accept that maybe on the longer run more current is drawn then the cumulative effect of a weeks worth of short trips, but why does a mains charger actually charge the battery when the car itself won't?
I'm now starting to question if it's the battery or the alternator.....