Battery change

L

lowrider

Member
My car is showing cc 415 denoting time to change it. If I buy a battery with same 60 amps as currently fitted can I fool the car by attaching a trickle charger thus saving reprogramming by the dealer. Has anybody on the forum changed a battery on an e89?
 
I just went to Halfords, £150 plus £25 to code. (paid £10 has it was the lad who fitted it his first coding).
Just go and be done with and save the messing.
Have to admit the tail lights seem brighter having some new electrons in the system.
 
lowrider said:
My car is showing cc 415 denoting time to change it. If I buy a battery with same 60 amps as currently fitted can I fool the car by attaching a trickle charger thus saving reprogramming by the dealer. Has anybody on the forum changed a battery on an e89?
Click to expand...


Why risk it????
 
With the coding I think it's more of a reset thing so keeping another supply on it won't work anyway. But as others have said, why risk it.
 
Just been looking at this post and thinking about jump leads Ect I have one of those cigarette to cigarette jump starters from asda does anybody know if these are ok to use if needed in BMW rather than jump leads
 
You would jumps start through a cig lighter?
Some guy in Canada on youtube was testing those small power packs and they would draw 200 amps when fed to a starter motor.
He was trying to disprove the claim they would deliver 1k amps!
 
Yeah I purchased it in ASDA store they are selling them for £15 it says you put one end into other cars cigarette lighter and other end into your cigarette lighter it has a volt meter also on it ?? I purchased it as it looked a bit of good kit if it works like I said I haven't tried it yeat so not sure if they are any good
 
Excuse the stupid questions here but if you disconnect the battery for ANY reason does it need recoded to the car?
If not, why does a new battery need coded to the car?
 
Thanks Flybobbie. Didnt know that.
So basically the battery can be disconnected as many times as you like and the car knows it is the same battery as you have not told it that it isnt.
I wonder where it keeps this info and for how long.
If the battery is disconnected for 3 months does it lose the info?
 
The final chapter. I bought a new Bosch battery and borrowed a 12 V motorbike battery which I connected to
the terminals prior to removing from the old battery thus maintaining the 12 V supply to my car. New battery fitted with no nasty messages on the dashboard. Happy days.
 
lowrider said:
The final chapter. I bought a new Bosch battery and borrowed a 12 V motorbike battery which I connected to
the terminals prior to removing from the old battery thus maintaining the 12 V supply to my car. New battery fitted with no nasty messages on the dashboard. Happy days.
Click to expand...
Did you read the link that Flybobbie put up?
Basically the car charges an old battery differently to a new battery and is why the car needs to be told it has a new battery fitted.
If the car does not know there is a new battery it could be charging the battery wrongly possibly reducing the life of the new battery.
I dont know if its wise not to have the battery reset.
Although you are saving the cost of a dealer or indy resetting the battery is this going to be cheaper/dearer than if the battery is knackered in a shorter time?
 
lowrider said:
The final chapter. I bought a new Bosch battery and borrowed a 12 V motorbike battery which I connected to
the terminals prior to removing from the old battery thus maintaining the 12 V supply to my car. New battery fitted with no nasty messages on the dashboard. Happy days.
Click to expand...

Not quite sure you know how it works. No offence. But it will need coding to prevent overcharging and make sure the life of the battery is prolonged. I know people have got away with not coding in the short term, but it's not something I'd personally do.. but each to their own. :)
 
I'm intrigued :) :)

that the car understands the 'old' battery isn't charging as well over time and is clever enough to adjust charge rate etc to compensate. But when a new battery is fitted the car can't recognize the 'better' charge rate and over charges.

Doesn't make much sense, but I still would have it reprogrammed just to be sure. There's a lot of electronic s in an e89 !
 
If a standard lead acid is used probably no problem, just shorter natural life and perhaps likelihood of problems when the battery slowly dies, hopefully with the roof not half open.
BMW probably took on board the AGM battery having a longer life, as they seemed to be used a lot on stop/start vehicles, thus reducing warranty claims at say 3 year lead acid life span. And AGM probably more robust for use with the hood and engine not running.
They just need more looking after regards charging, hence the coding.
 
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