AGM Battery
#11
Contributors
Thread Starter
Join Date: Dec 2005
Location: Chippenham, Wiltshire UK
Posts: 1,261
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: F11 535i M-Sport,, Silver, Black Leather, LED Adaptive headlights
Model Year: 2015
Engine: N55
Originally Posted by Ever' post='855675' date='Apr 22 2009, 10:43 PM
What is pre LCI?
Pre LCI refers to cars made prior to the mid life upgrade or 'Life Cycle Impulse' in BMW speak.
#13
Contributors
Thread Starter
Join Date: Dec 2005
Location: Chippenham, Wiltshire UK
Posts: 1,261
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: F11 535i M-Sport,, Silver, Black Leather, LED Adaptive headlights
Model Year: 2015
Engine: N55
Originally Posted by leo30d' post='856176' date='Apr 23 2009, 09:08 AM
so if you change your battery for any reason and dont reset or reprogram the car!! will the car still start and drive normal?
Many members have replaced thier batteries themselves without problems, others have had faults generated by the software.
Seems like you to have to hope for good luck.
#14
Members
Join Date: May 2008
Location: 32 miles North of Dallas, TX
Posts: 93
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: See signature
Originally Posted by KAF' post='856204' date='Apr 23 2009, 06:27 AM
Many members have replaced thier batteries themselves without problems, others have had faults generated by the software.
Seems like you to have to hope for good luck.
Seems like you to have to hope for good luck.
#15
Phil, that is really the question that nobody knows the answer to. My suspicion is that if the battery replaced is an exact equivalent AND the old battery is not near death or completely dead, one could probably get away without registration . No actual knowledge of this fact but intellectually your battery loses juice everyday from non-use . I have left car for three weeks and restarted on return without any faults, so obviously one is going from a partially discharged state and the system can deal with this. I can't see how it would even distinquish one battery from another.
#16
Contributors
Thread Starter
Join Date: Dec 2005
Location: Chippenham, Wiltshire UK
Posts: 1,261
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: F11 535i M-Sport,, Silver, Black Leather, LED Adaptive headlights
Model Year: 2015
Engine: N55
Originally Posted by pete540' post='856817' date='Apr 23 2009, 09:04 PM
Phil, that is really the question that nobody knows the answer to. My suspicion is that if the battery replaced is an exact equivalent AND the old battery is not near death or completely dead, one could probably get away without registration . No actual knowledge of this fact but intellectually your battery loses juice everyday from non-use . I have left car for three weeks and restarted on return without any faults, so obviously one is going from a partially discharged state and the system can deal with this. I can't see how it would even distinquish one battery from another.
I wondered that, surely a battery is a battery.
Then I got to thinking about all the complicated electronics in these cars, if they have been running off abattery that is close to death, it might only be shoving out 8-10 volts at times. The power modules would shift power around to make sure essential items got all they needed. They would have to maintain a 'memory' of the power distribution for each start up.
If you then put a new battery on, dishing out the full voltage, the power modules might start putting too much power into some systems, on the assumption it is still dealing with a reduced supply.
registering resets it to original settings so replicating factory levels for each system.
Just a thought............................probably wrong, but a thought.
My car died three times in the winter, had to use starter cables to get it going from my wifes car, so it certainly will have had some fault codes stored somewhere as the i-drive went haywire when trying to start it.
#17
Contributors
Join Date: Jun 2004
Location: FLA - East Coast, USA
Posts: 3,618
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: (USA) 645Ci, Silver Gray, Chateau, Cold Weather PKG, Premium Sound PKG, Sport PKG, Step, NAV [Std Equip in 645], HUD, Satellite (SIRIUS) Radio, Aux Input, Bluetooth enabled using iPhone 3GS w/ adapter cradle - Build date - 01/05, Baby delivered 2/24/05
Most electronics do not run directly off battery voltage. There will be a voltage regulator that will step down to the typical electronic module to 5v range for standard electronic computers and microcircuits. THere may also be some that operate at lower or higher voltages but again these voltages are "regulated" so they can operate over a broad range of input voltage from the battery/charging system. Generally anything between 14.4 and 8-10 volts will get the correct output to teh desired circuit. However, going too high in voltage is another matter and can cause temporary overvoltage protection to kick in thereby rendering that module non functioning until voltage drops back to normal range.
#18
Contributors
Join Date: Aug 2005
Location: San Jose, CA
Posts: 11,432
Likes: 0
Received 1 Like
on
1 Post
My Ride: E60 M5, F85 X5M
First of, stupid question. What does AGM mean?
Second, I had replaced my stock battery with a lightweight "motorcycle" type battery (Deka ETX30L) a couple months ago to shave weight on my car. I saved 37lbs from the swap. The car ran fine for about a month even after I let it sit idle for several periods ranging from 2-3 days. Then out of the blue I got an increased discharge warning. It would come and go even though I was driving the car everyday so I got annoyed and swap back the stock battery.
I thought either the battery was too weak for application on the M5 or that it was just a bad unit but perhaps I needed this recoding done? Hmm.....
Second, I had replaced my stock battery with a lightweight "motorcycle" type battery (Deka ETX30L) a couple months ago to shave weight on my car. I saved 37lbs from the swap. The car ran fine for about a month even after I let it sit idle for several periods ranging from 2-3 days. Then out of the blue I got an increased discharge warning. It would come and go even though I was driving the car everyday so I got annoyed and swap back the stock battery.
I thought either the battery was too weak for application on the M5 or that it was just a bad unit but perhaps I needed this recoding done? Hmm.....
#19
Members
Join Date: Aug 2007
Location: Irvine CA
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2004 545i titanium grey 6 speed manual with light grey interior. Nav, L7, cold weather, sport, sat. Modifications: suede headliner, pianno black interior trim, Ipod dock, Mtech front bumper, Angel Eyes, and flat black kidney grills.
Originally Posted by EuroCarFan' post='861871' date='Apr 28 2009, 02:36 PM
First of, stupid question. What does AGM mean?
Second, I had replaced my stock battery with a lightweight "motorcycle" type battery (Deka ETX30L) a couple months ago to shave weight on my car. I saved 37lbs from the swap. The car ran fine for about a month even after I let it sit idle for several periods ranging from 2-3 days. Then out of the blue I got an increased discharge warning. It would come and go even though I was driving the car everyday so I got annoyed and swap back the stock battery.
I thought either the battery was too weak for application on the M5 or that it was just a bad unit but perhaps I needed this recoding done? Hmm.....
Second, I had replaced my stock battery with a lightweight "motorcycle" type battery (Deka ETX30L) a couple months ago to shave weight on my car. I saved 37lbs from the swap. The car ran fine for about a month even after I let it sit idle for several periods ranging from 2-3 days. Then out of the blue I got an increased discharge warning. It would come and go even though I was driving the car everyday so I got annoyed and swap back the stock battery.
I thought either the battery was too weak for application on the M5 or that it was just a bad unit but perhaps I needed this recoding done? Hmm.....
#20
Members
Join Date: Aug 2007
Location: Irvine CA
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2004 545i titanium grey 6 speed manual with light grey interior. Nav, L7, cold weather, sport, sat. Modifications: suede headliner, pianno black interior trim, Ipod dock, Mtech front bumper, Angel Eyes, and flat black kidney grills.
Originally Posted by KAF' post='854964' date='Apr 22 2009, 03:35 AM
Took my car to the dealers this week for oil change and battery replacement as it had died three times during the winter.
As I do not drive the car much these days and it spends a long time parked up, I thought an AGM battery would be a good option.
Battery priced and ordered by dealer, then about two hours after dropping the car off I got a call.
It would take 3 hours of coding if they fitted the AGM battery to my car.
Apparently older pre LCI cars need a lot of power modules recoded for an AGM battery to work properly, the way the battery get charged, it's output characteristics etc cause problems with older power modules and older software versions.
These problems are not always immediately apparent, but can cause module failures at later dates.
So be warned, planning on a DIY battery change, and using a newer AGM battery when your car was not fitted with one as standard, might cause problems.
Check compatability first.
I settled for an old lead/acid type !!
As I do not drive the car much these days and it spends a long time parked up, I thought an AGM battery would be a good option.
Battery priced and ordered by dealer, then about two hours after dropping the car off I got a call.
It would take 3 hours of coding if they fitted the AGM battery to my car.
Apparently older pre LCI cars need a lot of power modules recoded for an AGM battery to work properly, the way the battery get charged, it's output characteristics etc cause problems with older power modules and older software versions.
These problems are not always immediately apparent, but can cause module failures at later dates.
So be warned, planning on a DIY battery change, and using a newer AGM battery when your car was not fitted with one as standard, might cause problems.
Check compatability first.
I settled for an old lead/acid type !!