Hi Steve. It is best to store any battery with a positive charge. Any battery that is completely drained starts a reverse electrolysis process that has a battery internal corrosion effect and will drastically affect the life of the battery. As long as there is some form of a charge in the battery when you store them (preferrably a 40% charge or more) the battery will be fine. If you have ever opened an old flashlight that had dead batteries in it, you would have seen the rusty red goo that forms on the ends of the batteries and destroys the battery contacts. It does not matter if the battery type is lead acid, Ni-Cad. or Lithium, the dead battery reverse electrolysis process will begin at ZERO charge. Just make sure there is a minimal charge (hopefully 40% or above) in the battery and you should be able to store them for up to 30 days with no problem as long as the batteries do not have any internal problems.
Thanks for choosing FixYa,
Kelly
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