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Lead acid is cheap, fairly efficient, plentiful, and non-toxic as long as you don't spill the acid or toss the battery.
Other than that, the only 'green' battery we'll likely ever see is a graphene-based cell... barring that, fusion reactor - pocket edition.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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