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your battery is 5 years old, expect it to die soon and possibly suddenly. as to your original question, if you wire directly to the battery, the battery is determinate , not the bike, but your further post says you don't want to kill tha battery by exceeding the charge capability of the bike, good call, do you have any other electric farkles installed? the rectifier and alternator have limit.
a trickle charger/battey maintainer plugged in at night is your best friend in cold weather.
a trickle charger/battey maintainer plugged in at night is your best friend in cold weather.