I've had the similar problem with my TL '06. The battery keeps draining on me, and just keep re-charging (I have a protable re-charger I keep on back seat, not trunk - u know why) the battery as needed. So, finally I boought a new battery. It lasted 3 weeks w/o problem. Then one monday, car has no power at all (again). So, recharged and took to my mechanic. His first question, "does lights flicker off and on sometimes when you turn or hit a bump?" - I said YES. He said, that's your fuse box or (MICO unit), which can only be fixed at dealer, because of computer electrical security code. It is common problem with Acura and Honda. I called dealer they said it will be about $900 to fix!!!