2011 23i battery drain

PKW · Post by **PKW** » Tue Apr 06, 2021 7:18 am

Hi,
Update, the battery was fully charged last night, I deleted all phones from the car and turned my Bluetooth off on my phone just checked the battery this morning and it’s back to 11.8 volts

. I will now do the fuse box checks.

mr.tourette · Post by **mr.tourette** » Tue Apr 06, 2021 7:54 am

PKW wrote: ↑Tue Apr 06, 2021 7:18 am Hi,
Update, the battery was fully charged last night, I deleted all phones from the car and turned my Bluetooth off on my phone just checked the battery this morning and it’s back to 11.8 volts . I will now do the fuse box checks.

Good luck, hopefully its not the first time of getting the e89 fusebox out, what a joy that is

Pbondar · Post by **Pbondar** » Tue Apr 06, 2021 8:51 am

I assume you haven’t got any non OE mods? Dash cam?

PKW · Post by **PKW** » Tue Apr 06, 2021 10:15 am

No dash cam or other none OEM add on’s fitted, I think I will be getting my hands dirty this afternoon

PKW · Post by **PKW** » Wed Apr 07, 2021 4:41 pm

Hi All
Update, didn’t get chance to look at the battery issue yesterday, but I did use the car and measured the volts when I arrived home and again this morning. What ever was not shutting down before is now, the battery was not drained today so looks like I may have an intermittent problem. I will keep you all updated.

Chippie · Post by **Chippie** » Wed Apr 07, 2021 5:42 pm

Well I don’t know if that’s good news or not.
Intermittent faults are always the most awkward to fix, it could be fine for weeks and then one day you come back to the car to find the bl##dy thing won’t start.

Pondrew · Post by **Pondrew** » Wed Apr 07, 2021 8:28 pm

Smartbear wrote: ↑Mon Apr 05, 2021 7:09 pm I understand locking the car via the remote puts the car “asleep” quicker than just leaving it unlocked, not 100% sure though
Rob

Not my findings. I have tested this; admittedly only via a battery trickle charger but:

If I leave the car locked for a week and not use it, it takes approximately 12 hours to fully re-charge the battery (1.2 amp charger= 14 amps drain)
If I leave the car unlocked for a week and not use it, it takes around 5 hours to fully re-charge (6 amps). I was assuming the extra 8 amps was draining from the alarm system.

I know it's sad, but we all need a hobby.

mcbutler · Post by **mcbutler** » Thu Apr 08, 2021 8:38 am

Pondrew wrote: ↑Wed Apr 07, 2021 8:28 pm
Smartbear wrote: ↑Mon Apr 05, 2021 7:09 pm I understand locking the car via the remote puts the car “asleep” quicker than just leaving it unlocked, not 100% sure though
Rob
Not my findings. I have tested this; admittedly only via a battery trickle charger but:

If I leave the car locked for a week and not use it, it takes approximately 12 hours to fully re-charge the battery (1.2 amp charger= 14 amps drain)
If I leave the car unlocked for a week and not use it, it takes around 5 hours to fully re-charge (6 amps). I was assuming the extra 8 amps was draining from the alarm system.

I know it's sad, but we all need a hobby.

I leave mine for weeks on end over winter, battery voltage is always above 11.9 and it always starts! I did have an issue a while ago with the glove box lamp being on 24/7 but thats fixed.
I was chatting to a battery and solar specialist the other day about discharge limits on 12v AGM Lead acid batteries that i use in my camper, the general assumption is that any discharge below 11.8v will damage the battery permanently!
He gave me some tech speak about when you charge an excessively dischared batteries it forms chemicals that damage it or something like that.
Anyway I fitted one of these https://www.amazon.co.uk/gp/product/B08 ... UTF8&psc=1 to the 12v accesories feed, you can set up the cut off voltage so you avaoid your battery over discharging...

Pbondar · Post by **Pbondar** » Thu Apr 08, 2021 9:02 am

Pondrew wrote: ↑Wed Apr 07, 2021 8:28 pm
Smartbear wrote: ↑Mon Apr 05, 2021 7:09 pm I understand locking the car via the remote puts the car “asleep” quicker than just leaving it unlocked, not 100% sure though
Rob
Not my findings. I have tested this; admittedly only via a battery trickle charger but:

If I leave the car locked for a week and not use it, it takes approximately 12 hours to fully re-charge the battery (1.2 amp charger= 14 amps drain)
If I leave the car unlocked for a week and not use it, it takes around 5 hours to fully re-charge (6 amps). I was assuming the extra 8 amps was draining from the alarm system.

I know it's sad, but we all need a hobby.

That’s kind of logical Jim...shows how much impact the pesky burglar alarm consumes...

I think SmartBear comment is still valid in the sense that formally locking the car sends signals to a variety of on board systems telling the car that the ‘state’ of the car is now ‘parked and locked’..in that process a number of systems should be forced to go to sleep.

If it’s left unlock it’s up to each of those systems went to go to sleep / switch off...the Bluetooth issue was caused by one of the units failing to go to sleep after a period of time of not being used

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