How to Charge 12V when disconnected from High Voltage Battery

[Zolfeghar]

So my high voltage battery on my 2014 S85 is bad and needs to be replaced. I just towed it back from the SC and I can't find the fireman's loop - looks like they removed it but forgot to leave it in the car.

The 12V battery is dead - my problem is that I need to get the main screen on to get out of service mode but when I try to charge the battery with a power bank it charges for 30 seconds and then trips for some reason and stops charging.

If I try, the dash screen will turn on and shows service mode but then turns off after 30 seconds.

Any ideas why the 12V won't charge more than a minute? Should I try disconnecting Neg terminal and charging the 12V directly via the Pos bolt? Currently I'm charging via the terminals in the nose cone.

 

[goodbadboys9]

You can hook it up to external battery charger like Schumacher SC1280.We have battery terminals behind the nose cone.

 

[beatle]

Only power banks I've seen were used to jump the car, not charge the battery. Some only stay on for a minute or so to protect them. I would recommend a 12v battery charger you plug into a wall socket. Also check the voltage on the terminals. If it's very low (like 6v) you may need a charger with a repair feature.

 

[goodbadboys9]

Yep,Powerbanks are useless in this case

 

[Zolfeghar]

Only power banks I've seen were used to jump the car, not charge the battery. Some only stay on for a minute or so to protect them. I would recommend a 12v battery charger you plug into a wall socket. Also check the voltage on the terminals. If it's very low (like 6v) you may need a charger with a repair feature.

Thanks - that was the problem. I bought a trickle charger and it's all good - car in now in park.

Unfortunately, I noticed that the SC had removed the fireman's loop but not reattached it and it's nowhere to be found. Went there today and they were useless - didn't even know who had worked on the car. Bought one from eBay for $40.