Those jump starters usually come with a 12v charger. You could connect it to your bike battery for charging. In the past I have used one of these to start cars and I recall in the instructions it stated to disconnect from the battery as soon as the car started. Not sure why it said this but I imagine that this would be the problem in using it on a motorbike. The problem may be that there is no overcharge protection if the charging current is coming back up along the jumper leads.
Just my limited knowledge..
JC
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