im starting to really hate bimmers

[eddybilt]

OK now I'm really pissed........Got my Beemer out of the shop thursday friday morning hooked up my bass boat loaded the car and headed for Lake Shasta (about 200 miles away). Launched the boat disconnected trailer and parked the rig for the weekend. Got up sunday morning to hook up trailer to pull boat out....DEAD AGAIN!!!!!!!
Thank goodness I have AAA. They came out in about 20 minutes and after trying to jump start my rig from under the hood we decided to remove spare tire and go right to battery. Success.. I Followed AAA to nearest Kragen to replace the brand new Dead Battery purchased 2 weeks earlier. Total cost 0 ...time wasted about an hour. We made it home. Once the boat was put up and the beemer garaged I decided to hook up my charger to see what the battery charge level was and battery was at 25% but it came up to fully charged after about an hour on 10 amp cycle. Leaving the battery on trickle charge until I can get the rig back to the shop tomorrow. The big question I have is that the car did run on a dead battery which to me means that the alternator is putting out power to run all the components of the car. The 2 batteries that have been replaced were new and fully charged. What could it be? HELP