![]() I'm interested to hear actual cases here. Question: Has anyone damaged a battery after replacement without performing the "register battery renewal" procedure? Has anyone replaced their battery without any issues? I may purchase a Bavarian Technic ("BT") diagnostic cable so that I can perform this procedure myself without going to the dealership. I have also read that people have just replaced the battery without any issues. I have read that the dealership and third party service manuals state that this is necessary and that the car may damage the new battery if the registration procedure is not followed. Several DIY guides and forum posts state that the dealership needs to hook up their diagnostic tools and perform a "register battery renewal" procedure to tell the car's ECU that you replaced the battery. It was 16 cents a foot, and it's good to have around.)ĭo you need to take the car to the dealership to perform a "register battery renewal?" I went to Lowes and bought the thinnest plastic hose I could find in the plumbing department. The Autozone Duralast 49-DL comes with a vent hose extension, but it is not long enough for the E90.I placed a small block of wood on top of the battery under the holding bracket. The OEM battery is slightly taller than the 49-DL.The larger 49-DL will mount using the same bracket without the padding. The pad is in the rear of the tray, towards the back of the car. The OEM battery (and 48-DL size battery) uses a Styrofoam pad and to hold it in place in the battery tray.The OEM battery is 48-DL, but the larger 49-DL will fit correctly. ![]() I went to Autozone and picked up a 49-DL series battery for $90. The strange problems started adding up, so I figured it was time for a new battery. All lights on the dash would strobe on and off whenever I started the car in the morning. The REST function would work 20% of the time. The stereo went silent for 10 seconds while I was switching between aux input and radio. The heater fan would only blow at 50% speed (but the defroster would blow at 100%). Throughout the week, I noticed a few other strange things happening. ![]() It's been getting colder around here, so I figured it was due to the temperature change. ![]() I noticed that there is a ton of posts about replacing batteries on the forums in the last few days, and I thought it would be good to share some tips below.įor the last few weeks, I've noticed longer cranks when starting the car. I replaced the batter on my early 2006 325i today. ![]()
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