Why we take batteries out before storing

This is what happens if you take a 1971 Stag, drive it until 1978 when the engine gives up, and then store it until 2007. You will of course remember to carefully drain and replace all the fluids, seal the interior, and cover the car correctly. What you will forget is to remove the original British Leyland battery, which over the next 29 years will disintegrate, filling your front valance with battery acid.. which in turn will disintegrate, taking the entire battery box, half the radiator, the fan, and most of the front bumper with it.