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If the battery runs down completely in 5 days, it is not operating near capacity. With a termial voltage of 12 Volts open circuit, it sounds like a cell has gone bad. Guy at Strauss auto is not too smart. A good battery should output 13.8 V to 14.4 V. I am not sure 1/2 hour would be enough to recharge a fully discharged battery.
Interstate batteries have a good reputation, but any battery can fail prmaturely. I am almost positive any interstate dealer will honor the warranty on your battery. Is Strauss auto an interstate dealer? Maybe he didn't want to give you credit for the prorated life of your battery. Interstate may have a website to direct you to dealers in your area. Even if you don't have the original receipt, there is usually some marking on the battery for the date of manufacture. Some batterys even have a way to mark when they are istalled.
Bottom line. If it were me, I would replace the battery before heading out across country. If the battery fails and strands you on the interstate, that can be no fun and dangerous.
Good luck on your trip. Enjoy your visit to San Francisco, it is a most beautiful city. I think there are plenty of brickboard members in the area also.
Dan.
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