Depending on mileage you will probably be able to just borrow the charger for the rare occasion you actually need to charge...
If you don't ride the bike for a few months the battery seems to discharge completely too. They do come up on ebay, I got battery + charger for £50
You sure you don't have a short circuit? My Shiv sits idle for months in the off-season and still holds its charge.
@dubtap started
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Depending on mileage you will probably be able to just borrow the charger for the rare occasion you actually need to charge...