Replacing Battery on an E90
I have had my 06 325i since new. It only has 18K miles. The warranty is over. The car gets parked for weeks with no starting issues. About 2 days ago I tried to start the car and it could barely crank but still got it started. After this noticng that the battery was weak I hooked up a 2A battery tender. After 3 days the car will not start. hooked it up to a 25A battery charger (while still in the car and connected) for about 8 hours and still would not start. Jump started the car and then drove it for about 20 miles keeping the revs up, while driving the radio would not have any volume to it and the brake light and ABS warning lights keep going on. When I got home I chyeck the brake fluid and the level is okay. Tried to start the car again and it is completely drained.
Called the BMW dealer on Guam and asked about this and they said the battery is dead. if i replaced the battery it would have to be the original one ($367) because the computer needs to know what battery it is and they also need to program the computer as to the charging rate it needs to be at. I can buy an replacement battery (Interstate) for $135.
I have an 04 Subaru STI with 16K miles on original battery a Mitsubishi Evolution with 46K miles just replaced the battery last year and never had this problems or things that needed to be done just to replace the battery.
I was also told that I should not disconnect the battery from the car or else I will need to take it to the dealer to reprogram, too late I already took it out to try and re-charge the battery.
I can see it coming I cannot compare a BMW to a Japanese car but why make this a complicated thing?
Any comments or suggestions? I think getting a $367 battery plus reprogramminng is crazy.
Does anybody have an idea what the specifications are for the OEM battery?
Last edited by WE90325; 04-28-2010 at 12:40 AM.