Fitted a new Battery today.
Motobatt MBTX16U.
Last one (same type), has been in since Jan 2016, and was getting a bit 'tired'.
Was regularly struggling to turn the Engine over reliably from cold.
If I just hit the Button and let it do it's 'Auto-Start' thing, it would usually just do half-a-spin, then stop, with the 'Blank Dash' scenario.
Holding the Start Button down bypasses the sequence, and it would always start, albeit with a slight pause as it struggled past compression.
Starts nicely now.
Found some damage on the old one, where the Welds on the Bracket had been rubbing.
Not far off breaking through maybe.

Might be worth checking if you have the early Small Tank model.
I removed the original Foam Rubber Pad it sits on, and used some slightly thinner Adhesive-backed Foam, adding a section where those Welds are.
Also levered down on the Retainer while tightening the Screws, to make sure it was as secure as possible.