I've had this problem for several weeks now. I had Braille Battery in the car and I pretty much had to keep trickle charging it. Took it to an auto parts store two weeks ago. Alternator tested fine, battery was week, so I went ahead and got a refurbished one. Worked well for two weeks until having starting problems again. Took it to get the alternator checked and battery again...alternator is good and battery is good. One thing they noted that I needed to replace the belts. Did that two days ago without any issues. I was able to start her up all day and took her to work the next day. This morning battery was completely drained down to 13%. I've already disconnected all accessories borrowing power...LED's, screen and power inverter. How can I diagnose what's draining the battery? Any help would be greatly appreciated.

 

There are lots of how-to videos regarding parasitic draws on Youtube. Here's a good one from Eric the Car Guy: