Weird Dead Battery

[Mtwem]

Hi all,

I had a weird experience this afternoon, i came back to my 2010 T5 to find the driving lights on, and the battery completely dead.
I was unable to lock the car, or turn it on with no ticks over at all.

Despite turning off the driving lights - they remained on, even with the dead battery and unable to lock or turn the car on.

I set up a jumper cable and had it connected to a running car for 10minutes and the lights turned off. Unable to start the car after 10+mins waiting, I gave up hope and called it a dead battery - however as soon as i disconencted all the jumpers, the driving lights turned back on....

Has anyone had an experience like this before?

I've disconnected the negative for now...

Cheers all.

[Mtwem]

I'm planning on just getting a new battery today - but was curious to see if anyone had any insights if it were something more sinister, found the lights being on very odd.

[Mtwem]

As an update - old battery is getting recharged and will take back to test in car tomorrow to see if the driving light fault is still present.

[Sunny43.5]

Only a guess but after you refit the battery it may clear a fault in the ECU BCM , its a bit like a computer with a glitch turn off power and allow it to reset .

[Lucas_R]

Modern cars do behave strangely when the battery is on its way out - so may well just be "normal" and to add to the list of more common weird things these cars do when the battery is on its way out.

[Transporter]

As an update - old battery is getting recharged and will take back to test in car tomorrow to see if the driving light fault is still present.

If it’s older battery, you’re wasting your time recharging it. The batteries don’t like to be completely discharged, if it happened to the new battery it maybe ok, but the old one, very unlikely. You can get stranded somewhere.

[Mtwem]

Yes that was my thoughts as well, however the auto elec ensured me it would be fine - with a "healthy 104%" reading being returned after the full recharge.

I need to get a rego check in a week so I'll aim for a second check and likely purchase a second check.

Van is fine now, have'nt driven substantialy but it seemed to reset the issue. Will get a computer scan for errors on rego check to confirm anything else that may be wrong./

[Mtwem]

Thought id give an update.

Went to get rego check and got a scan as well - no stand-out issues -
Checked battery lvl again and had dropped back to 60%.

Confirmed the need to buy a new battery

[Kiels3927]

Yep, that parrot is dead, deceased, joined his maker.

[JustCruisn]

Did you check the alternator output also ?
It has not been mentioned in the thread so far.