Charging issue 12V battery

StevenDS85 · 03-20-2021, 04:36 PM

Yesterday I’ve charged my 12V battery with my CTEK charger. After charging auto stop/start works fine again. I drove the car over motorway for 60 miles and changed to my summer tyres. When returning we did a stop in between and since then auto stop/start did no longer worked. I have the feeling that my car is not keeping the battery voltage to the voltage needed to keep all the functions up and running. Any idea what it can be? P.S. I noticed this behaviour earlier, so not the first time.

P.S. not a huge issue, but it better gets solved now that the car is still under warranty.

newway · 04-10-2021, 06:15 PM

A lot of factors affect auto start/stop, so it is not a reliable indicator. You may have air cond. etc at full blast that drains the battery even you were driving. You may also have some equipment (e.g. dashcam parking mode)...
The only way to check is to measure your battery voltage I suppose.

machman767 · 04-11-2021, 04:52 AM

Doesn't the outside temperature also affect if stop/start works?

03-20-2021, 04:36 PM	#1
StevenDS85 I ///M Fan 336 Rep 367 Posts Drives: BMW 330i M-Sport Join Date: Apr 2019 Location: Belgium iTrader: (0)	Charging issue 12V battery Yesterday I’ve charged my 12V battery with my CTEK charger. After charging auto stop/start works fine again. I drove the car over motorway for 60 miles and changed to my summer tyres. When returning we did a stop in between and since then auto stop/start did no longer worked. I have the feeling that my car is not keeping the battery voltage to the voltage needed to keep all the functions up and running. Any idea what it can be? P.S. I noticed this behaviour earlier, so not the first time. P.S. not a huge issue, but it better gets solved now that the car is still under warranty. Last edited by StevenDS85; 03-20-2021 at 04:45 PM..
	Appreciate 0 Tweet Quote

04-10-2021, 06:15 PM	#2
newway Enlisted Member 15 Rep 31 Posts Drives: BMW 320i M SPORT Join Date: Jan 2020 Location: LONDON iTrader: (0)	A lot of factors affect auto start/stop, so it is not a reliable indicator. You may have air cond. etc at full blast that drains the battery even you were driving. You may also have some equipment (e.g. dashcam parking mode)... The only way to check is to measure your battery voltage I suppose.
	Appreciate 0 Quote

04-11-2021, 04:52 AM	#3
machman767 Lieutenant 234 Rep 584 Posts Drives: 320i M Sport+ Join Date: Nov 2017 Location: Preston iTrader: (0)	Doesn't the outside temperature also affect if stop/start works?
	Appreciate 0 Quote