So I had found a second hand RR (risky I know) but knew the person and it passed all the tests I did and was free. Worth a go I thought. Now the problem is that the tests I did on my old one also passed with a multi meter. After recommendations I swapped it out but my battery will randomly reset my clock when I try and start it about once every week, maybe 2 weeks if I'm lucky. Is the battery dead or is this a charging issue? The test I just did after full charge the batt i was getting a reading of 13.58v engine on and idle 12.87v engine rev at 2k rpm 10.12v engine start . Is it worth just getting a new RR and batt and stop being cheap?