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Originally Posted by Dujon
Most lead/acid batteries, wet or sealed, will store well when charged ( the preferred method ) for significant lengths of time. Unlike some other rechargeable batteries (e.g. Ni-Cd) which are recommended to be discharged prior to storage. In other words, unless you are intending to store the things for, say, 12 months or more, there is no need to worry about them provided that they are fully charged at the time of moth-balling.
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Actually most don't, self discharge on Lead Acid varies from about 3 to 5% per month for solar grade batteries (e.g. BP PVstor batteries acknowledged as one of the best made are 2-3%) and can be significantly higher for deep cycle batteries, they may seem to hold up OK over the period but they are gradually sulphating.