HELP! Parasitic Battery Drain After Accident

[BMW_E53]

Hi everyone,

It’s been awhile since I’ve last logged on but was wondering if any of you can help me. My X5 was involved in a rear end accident, airbags did not deploy but the impact was enough to explode the BST. I’ve since replaced the BST/positive cable with a new one and now I’m running into what seems like a parasitic draw.

Some back story, before the accident, I bought a new Interstate AGM battery (same exact model) that replaced the dying battery. 2 weeks after installing the new battery, my mom gets rear ended and the car won’t start due to the BST. Car was towed to the yard and when my dad went to pick up the vehicle, the car was completely dead, no power whatsoever. Which is weird because 1) the battery is only a few weeks old and 2) the forums and YouTube videos said I should still have acc power even with a blown BST. So I thought the battery must’ve been damaged due to the force sustained upon impact. So I went ahead and purchased another new battery and 2 weeks later, I go to start the car and the crank was weak. Figured it was due to the car sitting. Drove the car around after replacing the front control arms, everything was good just needs an alignment now. Thursday on the 3rd week since instal comes and my dad tells me the car is completely dead again.


I’m currently charging the battery and will check if it will hold charge. Will also try to run tests to try and locate where this draw is coming from. Would any of you happen to know what could potentially be causing the draw after an accident? Is there a module or safety sensor I had to replace after the BST explodes? I feel like I could be going down the rabbit hole trying to find the culprit and want to possibly avoid that if possible if someone has knowledge of what could be going on.