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Due to Peukert's law, batteries can lose 8 to 20 percent of their original charge every year at a temperature of about 20°–30°C. This is known as the "self discharge" rate and is due to non-current-producing "side" chemical reactions, which occur within the cell even if no load is applied to it.
If the environment in which a battery is stored in is not cool and dry, leak or faster discharge takes place . Batteries work on the principal of converting chemical energy in electrical energy , so the chemical reaction is always active more so if ingredients are in contact with each other . (closed circuit)
The leak also depends on type of fuel used Liquid, Paste or Hard Cake Fuel,the Safest being Hard Fuel. Zinc Carbon is a paste based battery
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