You should also be able to lift the seat the extra half inch necessary for the battery terminals by just cutting a section of the seat pan out or putting spacers under the seat pan, if you still wanted to fit one in there.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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