I work for a water providing company and a problem occured considering a 13.2v battery! Normally the bat. should work for a period of 3 years at least but it went almost dead in about 2 months.The bat was stored for an other 2 years at the storage, without putting it to work.What could be the reason that the battery went almost dead in such a small period of time?could electromagnetic fields interact with the life period of the bat?