Parasitic battery loss - advice from auto elecs please

93_Clubman · Postby **93_Clubman** » Sat Jan 10, 2015 11:59 am

Dave, great to hear that some of the issues are getting resolved. Ref battery going from 13.00 volts to 12.92 overnight, was 13v reading taken after the car had sat overnight like the 12.92 reading, or had the car been dríven more recently or battery charged more recently? If latter then understandable - even if former I wouldn't think the drop is enough to worry about if it doesn't get any worse.

davekmoore · Postby **davekmoore** » Sat Jan 10, 2015 6:29 pm

13.00v was straight after driving it on a mild night.
12.92v was the next morning (coldish) after it being parked up overnight.
Also 12.92v today after a drive to work in the morning then being parked outside work all day at around 19 degrees.

Postby **Okibi** » Sat Jan 10, 2015 10:02 pm

http://batteryuniversity.com/learn/arti ... mperatures

93_Clubman · Postby **93_Clubman** » Sun Jan 11, 2015 10:50 am

Also, you're seeing the slightly higher voltage straight after driving (& some charging via alternator), whereas slightly lower voltage is after the vehicle has sat for say 8-10 hours.