The poorly battery trouble I've had always tracked back to the regulator/rectifier (both times killed by jump-starting from a running car - there's a lesson there somewhere...)
If you've had trouble across two bikes with similar usage where the common factor is the battery-tending thing (i.e. you've not done anything to hurt either's electrics), I would start to suspect the battery tender! Especially if it's had trouble with a mate's battery!
I'd certainly pause before connecting it up to another £140+ of battery! Dunno what you could do to check it's working though.
Other than that though, Yuasa are a pretty reputable battery maker. Mine's been grand over the last couple of years.
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