MG4 - batteries dies at -40c

[xcyber]

This test is in norwegian but u can watch what happend after one day in -40c.

MG4 -40c

 

[stevegus]

To save everybody watching a Norwegian language video they can’t understand….. basically the MG 12v battery collapsed to 3v. So nothing works. NOT THE MAIN EV BATTERY the plain jane 12v lead acid one.

So the take for most UK members is :

We dont get much past -10 here let alone -40C so we dont need another on the list of worries.

 

[Ian Key]

To save everybody watching a Norwegian language video they can’t understand….. basically the MG 12v battery collapsed to 3v. So nothing works. NOT THE MAIN EV BATTERY the plain Jane 12v lead acid one.

So the take for most UK members is :

We don't get much past -10 here let alone -40C so we don't need another on the list of worries.

I agree and it's not just the MG4 that wouldn't start. Any vehicle with a 12v battery wouldn't start either.

 

[Kithmo]

Panic over

 

[TheHypnoToad]

It does beg the question, why are they still putting 12v lead acid batteries in EV's?

 

[WonkoTheSaneUK]

It does beg the question, why are they still putting 12v lead acid batteries in EV's?

Elon asked that question, and now Tesla fit Li-ion 12V batteries.

 

[thejaybeeok]

It does beg the question, why are they still putting 12v lead acid batteries in EV's?

They’re cheaper

 

[Torryhun]

Elon asked that question, and now Tesla fit Li-ion 12V batteries.

Is it possible to just swap them out??

 

[TheArcher]

They’re cheaper

And there are millions still to get rid of.

 

[xcyber]

Not often its -30 to -40c where I live in norway but if its get so cold its only to put a charger to the 12-volts battery overnight to keep the battery alive.. (or use the V2L if you are a place with no power outlet) The battery on mg4 and kia niro died actually.. could not recharge it and they had to buy a new one. but it was interesting to watch that the Renault Megane e-tech actuallly had more volt in the battery after 24h in -40c Looks like that car have a better function to charge the 12-volt batttery when its needed from the main battery.
And that is perhaps somthing that can be updated in a fix later from MG ?

 

[stevegus]

Is it possible to just swap them out??

Yes.

But if it’s anything like the leisure battery in my motorhome

Lead £100
Lithium £500

Xcyber- yes you wouldnt think it impossible for the main battery to charge the 12v to stop it dying.

Unless the -40c kills it and its a losing battle

 

[Torryhun]

Yes.

But if it’s anything like the leisure battery in my motorhome

Lead £100
Lithium £500

Same I'm afraid with my golf trolley,
Lead £95
Lithium £250

 

[Kithmo]

Would the 12v BMS (or charging system) be suitable for a Lithium 12v ?

 

[Ayoull]

Would the 12v BMS (or charging system) be suitable for a Lithium 12v ?

Most of the 12v Lithium car batteries are designed to be drop in replacements, the biggest issue is you can't jump them with another battery like you can or should I say the manufacturers strongly advise against it by stating "do not parallel batteries" and you can't use traditional battery chargers, and don't take the voltage above 14.2v else you'll damage the cells, where as a lead acid can float at 14.8v easily which is generally the highest output from an alternator.

 

[turntoport]

It does beg the question, why are they still putting 12v lead acid batteries in EV's?

Lead-acids are well-suited to cranking the starter-motor...

 

[paulm]

 

[remarkable1967]

This test is in norwegian but u can watch what happend after one day in -40c.

MG4 -40c

MG4 - batteries dies at -40c !!!​

I think most things would die at -40c

 

[stevegus]

Most of the 12v Lithium car batteries are designed to be drop in replacements, the biggest issue is you can't jump them with another battery like you can or should I say the manufacturers strongly advise against it by stating "do not parallel batteries" and you can't use traditional battery chargers, and don't take the voltage above 14.2v else you'll damage the cells, where as a lead acid can float at 14.8v easily which is generally the highest output from an alternator.

Hmm. So how does the vehicle alternator “know” that someone put a lithium in? And many alternators can go to 14.4-14.8 volts.

Its my understanding that the battery has charge management built into it.

MG4 - batteries dies at -40c !!!​

I think most things would die at -40c

Yeah. Im in the electronics industry and typically domestic spec is 0-70c. Industrial is -20 to 85c.

Working at -40c is a high end military spec

 

[siteguru]

Extended industrial is -40 / +85C

 

[tsedge]

At what temperature does the MG4 melt?