The theory seems sound on its face but I wonder if the real change in the rate of degradation of the battery is significant or even measureable. You could clear out some space in the fridge and buy a couple boxes of batterys, keep some in the fridge and the rest not and then test them periodically. Or you could write to Mythbusters and see if they want to bust it.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.