I've been without my '48 for 3 months and have used a terminal switch to disconnect the battery. (I once or twice left the Walmart battery connected for 3 months and it started immediately.)

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.