12V Battery Auto Charging Info

[MikeJS]

The manual states:
When the vehicle is powered OFF and the system detects that the 12V battery is running low, the vehicle will automatically charge the 12V battery under certain safety conditions to prevent the vehicle from failing to start due to low battery. This function will be automatically turned off upon completion of charging.
Note: When the system detects a fault/vehicle start/charging with an external device, it will automatically exit the 12V battery automatic charging function.

All fairly standard.

It then states:
Note: This function will be temporarily disabled when the high-voltage battery pack is running low. To avoid flat battery, it is recommended to charge the vehicle as soon as possible when the CLTC driving range is less than 70km.

Now given that the CLTC range estimate is supposed to be more optimistic than WLTP (around 15 to 25% more) so that should mean we need to keep the WLTP range to above about 50km…...

Pity they do not state a simple SOC % but then of course it seems we cannot see the SOC %!!

 

[evets]

The SOC% is available in My Car>Set

 

[Joningy]

The manual states:
When the vehicle is powered OFF and the system detects that the 12V battery is running low, the vehicle will automatically charge the 12V battery under certain safety conditions to prevent the vehicle from failing to start due to low battery. This function will be automatically turned off upon completion of charging.
Note: When the system detects a fault/vehicle start/charging with an external device, it will automatically exit the 12V battery automatic charging function.

All fairly standard.

It then states:
Note: This function will be temporarily disabled when the high-voltage battery pack is running low. To avoid flat battery, it is recommended to charge the vehicle as soon as possible when the CLTC driving range is less than 70km.

Now given that the CLTC range estimate is supposed to be more optimistic than WLTP (around 15 to 25% more) so that should mean we need to keep the WLTP range to above about 50km…...

Pity they do not state a simple SOC % but then of course it seems we cannot see the SOC %!!

Very interesting @MikeJS
Sadly Mike, my high voltage battery didn't seem to worry about the 12v battery going flat despite there being 74% remaining.
But I did use a smart charger which also didn't add anything to the 12v battery, maybe some sort of conflict with the HV battery, all a bit of a mystery, but all sorted by Penton MG in Salisbury, they even supplied us a taxi to get from the garage into city centre, brilliant service.
Seems OK again now!

 

[MikeJS]

Very interesting @MikeJS
Sadly Mike, my high voltage battery didn't seem to worry about the 12v battery going flat despite there being 74% remaining.
But I did use a smart charger which also didn't add anything to the 12v battery, maybe some sort of conflict with the HV battery, all a bit of a mystery, but all sorted by Penton MG in Salisbury, they even supplied us a taxi to get from the garage into city centre, brilliant service.
Seems OK again now!

What type of smart charger did you use? As the 12v is lithium I understand it needs a dedicated type of charger.

 

[Joningy]

What type of smart charger did you use? As the 12v is lithium I understand it needs a dedicated type of charger.

@MikeJS I wonder where you got the info that the 12v battery is lithium?
My info tells me my MGS5 is bog standard lead acid!

 

[MikeJS]

@MikeJS I wonder where you got the info that the 12v battery is lithium?
My info tells me my MGS5 is bog standard lead acid!

OK. The IM6 definitely has a lithium 12v battery. Is your IM5 the 100kwh or 75 kwh high voltage battery.

 

[MG Clive]

OK. The IM6 definitely has a lithium 12v battery. Is your IM5 the 100kwh or 75 kwh high voltage battery.

@Joningy has the MGS5, not an IM.

 

[MikeJS]

OK. The IM6 definitely has a lithium 12v battery. Is your IM5 the 100kwh or 75 kwh high voltage battery.

@MikeJS I wonder where you got the info that the 12v battery is lithium?
My info tells me my MGS5 is bog standard lead acid!

Seems you are on the wrong forum...

 

[Joningy]

Seems you are on the wrong forum...

Somehow I've slid into the wrong slot Mike, good job I'm not flying you home to the wrong airport!

 

[Joningy]

@Joningy has the MGS5, not an IM.

Apologies Clive!

 

[MikeJS]

Apologies Clive!

I have often clicked on the MGS5/6 links by mistake….