I had an independent shop do it, but yes they programmed the battery. I was there and watched as they hooked up the machine and told the car it had a new battery and inputted the correct capacity of the new battery. It's a DieHard Platinum battery. Matched all the specs of the OEM battery. OEM battery from the Bentley dealership would have cost $650 and the DieHard Platinum was $300.

I suppose finding a source of parasitic draw could be very costly. Probably would cost $500 just to hear "we couldn't find anything."

 

Yea, that’s definitely not the answer we’d want to hear when we know there’s an issue.

Unless you recently installed a dash camera or something. Or even noticed a change in the vehicle around the time of the battery issue started; it may point us in a direction.

 

LOL Bruce I obviously need to step up my game some.

 

Whatever works!

 

I have a habit of hanging the extension cord for the charger on the driver's side wing mirror whenever my cars are left charging. The garage configuration favors parking them the front against the wall and backing out so a cord going to the trunk is easily noticeable, under the hood in cars that have battery there not so much.

 

Hi,
I may be late but having had this problem I'd like to make a few comments.
I had a problem of rapid discharge of the main battery and to understand I used a clamp ammeter
Normally, with the car locked, consumption should be between 0.04 and 0.05A and I had .....6A!
After investigation (fault code check), it was the Kessy box.
But after replacing the Kessy box, there was still a residual consumption of 0.5A.
And I stumbled across the problem: the glovebox light switch with a calibrated gap that's too short - a design fault, as I'm sure many have or have had this problem.
In fact, the gap is so short between the switch and the contact point that, depending on the outside temperature and the way the glovebox is closed, the internal light stays on, and there was 0.5A of residual consumption.
Since then, I've corrected the problem and it's gone; I check it sometimes with a clamp ammeter and it's always around 0.04A.

To sum up, the glove box is something to keep an eye on!

 

This is not just a Bentley issue, but an issue with all modern vehicles, as they are now constantly connected, and thus getting Over The Air updates. Even if not driven for a week a battery can die. Best solution is to plug into a battery tender when not being driven.

 

FWIW, Today while just driving the car forward 3 feet so I could open the trunk (it's backed up tightly to the wall), I forgot I had the magnetic plug attached and it just popped right off without drama. So I guess now I know if I ever forgot and drove away with it still attached, it's no issue at all. It just detaches harmlessly.

 

Amazing detective work @redstr3842 ! Which clamp ammeter did you use/where can I get one to see the draw, and where did you connect it?

What is the Kessy box, where is it, and how much does a new one cost?

How did you know that the glovebox light was still on after you closed the glovebox?