My 05 tl keeps dieing over night, I checked my alternator with autozone and it checked out good but the battery was bad. I disconnected the HFL a long time ago so I doubt it is that. But once I jump start it and drive around it turns back on and off fine. I need help, what is killing my battery? Please!

 

So did you get another battery after the other one was found to be bad and the new one is dying as well? Sometimes batteries can be bad straight from the store. Check the posts to make sure there is no corrosion. Not sure what else could drain the battery.

 

Had same problem with my 06 tsx. Replaced the battery twice. If I did not use it for a few days it would not start. Even tho the alternator tested ok I had it replaced. No problems since then.

 

I have similar problem. I can't leave my car without running for around 8 hours, or my battery die. I pulled my HFL out as well a while back, same problem. If I keep my car active between the 8 hours, it'd be fine.....