In-line Fuse

Hi H.O.

DD is correct I would fit no more than a 10A fuse into the + line as you should never need more than that even for charging the battery, you could even try with a 7.5A but that might be borderline for initial charger start-up for a flat battery.

I actually made up a 3m "jump lead" for battery charging to and from other vehicles with a Din plug and croc clips so I could boost my or another bike battery as a get you home measure. Takes up very little room !!