Sorry, this is a bit late - just seen the thread!

I would have taken a different approach, as you are removing the battery from the bike to charge it, I would have gone for a normal battery charger with a deep charge cycle, these will cost around the same as an Optimate (around this location anyway) but are more suited to varied uses (such as recovery of a very dead battery). You can also 'fast charge' if you need to get the bike going quickly.

Optimate, for on-the bike charging and maintenance is the way to go though.

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