Voltage from under bonnet terminals

[Booboo]

Just asking what voltage should I expect from the charge point under the bonnet? I know fully charged I'd should expect 12.8v but would this be the same whilst still connected to the car? I'm getting 12.2v

 

[Mr Olympik]

Is the car switched on?


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[Mr Olympik]

12.2-12.6V is normal for a fully charged battery, if you start seeing 10.5 then that might show a failed cell.


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[NHN]

12.2 is ok, can always get the battery checked, use a battery monitor device, via an app.

 

[Booboo]

I charged the battery to what the charger said was 100%. The voltage shown 12.2v with the ignition off Carista shown the battery at 82% today it says 68%. I've not had any issues I wanted to check as I realised sometimes the start stop wasn't activating.

 

[Booboo]

What is the auxiliary battery for? Part number 8W0915101

 

[Mr Olympik]

Auxiliary batteries run your stereo and electronics, the main battery is for the engine and climate control


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[Booboo]

Just found this that explains the system a little better