Hey Alex,
Batteries these days are pretty crap. The smaller 12V ones will only last about 18 months with regular charging. The past two winters have killed of two batteries for me, and the worse thing you can do is leave a bike running idle.
Yours is probably dead. You could push start the bike, but the charging system wont revive a dead batt.
Best advice is always disconnect if your not using the bike for a long time, and charge regular.
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