Q: Charging system battery keeps getting drained

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Battery an both battery cables are new,alternator was replaced recently, connections have been cleaned. Had it tested at shop alternator, battery load ck. Every thing passed. But I can drive the car around for 1/2 hour or so shut it off and the battery won't start the car. always carry jumper cables every were I go.:/ Any ideas I was thinking ignition switch maybe shortin out? Starter ,? Besides charging system check well running, also had the alternator bench tested off the car an passed also, .I am stumped. Any help appreciated.

My car has 150000 miles.
My car has a manual transmission.

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