There are a variety of inexpensive wall-wart packaged float chargers for
lead acid batteries around. Might be easier to just get something off
the shelf.
http://www.power-sonic.com/images/powersonic/chargers/AC-Series_12_Aug_15.pdf
http://www.mouser.com/search/refine.aspx?Ntk=P_MarCom&Ntt=172260151
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