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How old is the battery? I learned at Sears while working there in the battery department that the average life of car batteries is about 3 years. So, after that, batteries lose a significant amount of their performance CCA or cold cranking amps, and may have to be replaced on a pro rated basis after that period of time, on average.
I put a diehard platinum battery into my 1997 Cadillac Deville Limousine for about $189.99 plus tax and it has a 4 year replacement warranty due to bettery construction.
However, if you get Walmart's best Maxx battery, they have a 3 year replacement policy and they charge about $79.99. I put that into my 1990 Cadillac Deville.
Good luck on resolving the battery drain problem with a good alternator.
Have your mechanic adjust the interlock between the trans and the brake. In doing so you will also adjust the brake light switch which should cure your battery drain problem.