Out of curiosity, how cold was that?

+1.... check for a deformed case as well. A discharged battery will freeze and the cells expand, possibly shorting out cells, which can spark when a charge is applied.

If it's more than 4 years old, maybe just replace it, o/w have a pro check it out.

FWIW, my FEH battery has removable caps, but don't know if older models did.

 

There is a special jump start procedure in the manual for the HV battery. Get CAA out to your vehicle and let them do the testing and look at the HV jump start procedure. It could also be a 12V battery connection or a bad battery cable.

GaryG

 

You should have a BXT-96R and I should have a BXT-40R. I never paid attention as to if mine had any caps at all. Most do need a vent hole so I probably have caps too but they may only cover a tiny vent hole. Not sure if one could see anything through them.

 

Hello Good Folks!

Thanks for all your responses...

Gary, thats exactly what I did, called CAA, they got a booster and I had the car up and running in seconds Thankfully, I didn't have to do anything with the HV....it started running as soon as the car warmed up..

BTW, my battery does have removable caps and I checked inside to see if the electrolyte was frozen but, it was still fluid. I suppose in colder countries the battery doesn't freeze because the temperature was below 0 (-5C to -8C) almost every day that I was gone.

Had a bit of a scare because one of the caps popped off and fell in a dark corner where I couldn't reach with my hand. I had to crawl under the car in the freezing snow and pry it out with my fingers In the end no harm done...

Cheers!
Anish

 

In the future try turning the key on and then waiting about 10-20 minutes for the 12 volt battery to be charged by the HV battery.

 

So what are you doing to prevent this from happening again?

If your terminals are corroded, that prevents the battery from fully charging. They can easily be cleaned.

 

That's not going to happen Willard. If the 12V battery was so dead it could not open the contacts from the HV battery to start the vehicle with MG1, how is it going to open any contacts from the HV battery?

I sure hope my kids take care of me when I get older.

GaryG

 

The terminals aren't corroded and the electrolyte level was also ok. I guess the battery went dead because it was parked outside in the cold for 20+ days.

Next time I will make sure someone starts the car every now and then to warm it up a bit...

 

That doesn't sound right. This battery only closes a few relays. It doesn't have to crank the engine. I'd have it tested once it's fully charged.

 

Contacts..? like an electrical relay contact..? Those got tossed back in the dark ages of hybrid design, solid state switches, HV mosfets, ONLY.