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The battery will drain down because the computer is always pulling a little current to save it's memory. One thing you will have to do though is when you re-hook the battery, make sure to turn the key on BUT DON'T START IT. Leave it on for a minute, then restart it. Toyota's have a problem restarting after a new battery if you don't follow this step. Also, an easier fix for you might be getting a slow charger to leave hooked up to battery for the time it's being stored. Many battery chargers will shut off after the battery is fully charged, then come back on when it needs charging. Good Luck!!

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15y ago
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Q: My Toyota Sienna is parked for extended period 6 months in the garage brand new battery drains on its own even if I have everything turned off if I unhook the battery will it preserve it why is it?
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