[ttbmer]

Hello. I need to change my battery, dealer said is not something I can do my self because it needsto be register to the car and that when the old battery is removed a bunch of sensor will reset so it gas to be done by a pro. They want 250 for oem one plus 1h labor which is 150 plus taxes. That sounds like a lot to me and don't know if they r BSing me.

I call a local shop which is where a get most of my staff done and they said to go after market because the warranty on the battery is 2 years comparing to the 12 month of the OEM. The they charge me 1h labor which is 90$ plus taxes.

Then I call my friends mechanic and he also said go aftermarket battery cus is cheaper and better warranty but he's only changing me 15$ because he said is only a 10-15 min thing.

So I don't know who to believe now.

[StoneCold]

Here you go. Hope its help.
http://www.e90post.com/forums/showth...=445615&page=4

[bimdaddy]

Oh God this topic is like Which is better, manual or auto? There has been numerous discussions about this. As for me, I replaced mine with a Walmart battery and 1/2 hour work. Works perfectly, no warnings no issues. I have been to the dealer since installing this battery and no codes were ever found. Dealer quoted me 450. Don't waste your hard earn doe.

[Tag]

http://www.e90post.com/forums/showthread.php?t=445615

[scrufy]

You can Wallmart the Battery but do yourself a favor and buy a BT cable.
You use that to register the new battery.
The system uses different charge rates based on the age of the battery. Thats why they tell the system it is a new one.
as for the sensors going off: That is complete horseshit. I take my battery cable off all the time to do wiring things and add/remove tune for service etc... never a battery code thrown yet.
I'm still at a loss why the system really needs to know about the battery age. I would think it could tell from the charge rate vs current voltage and temp to simply figure out how to charge it.

[hubble bubble]

Changing out the battery is easy. But when the power goed down, even for a second or two, all of the presets will erase - radio, seats, mirrors, even the ECU.

You can buy a tool to temporarily keep the power to the computer for $15-20. Any mechanic has a professioal version ($100+). If you pay a shop to do the change it is thier responsibility to fix anything that resets because the power is lost. But it is a job any compentent mechanic can do in 20 minutes or less.

[lobotomy]

Originally Posted by scrufy

You can Wallmart the Battery but do yourself a favor and buy a BT cable.
You use that to register the new battery......

I was looking at the BT site. Bummer that the enthusiast version can only handle up to 3 VIN's. They don't have a way for you to replace one VIN with another should you get rid of one BMW for another one.
It seems the BT cable services up to 2009 BMW models. I guess there is a few years lag in updating.