Not sure about anything being wrong (unless you are leaving the power on). Have you performed any mods to the bike that involved the electrical system? You might want to invest in a good motorcycle battery charger (like a battery tender). I bought one shortly after I got my America. I try to charge each time I know that I won't be using the bike for a while, and almost every time prior to using the bike. Currently I am still running with the OEM Battery, which is just over 6 years old.
I would take the battery into a local Auto Parts store and have it tested before replacing again. A good charge might be all it needs.
Tom
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.
Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)
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