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Take battery out and give it a tumble and shake. If its a wet plate battery lead acid. They like having the acid inside moved around a bit, might have a faulty plate (not fixable as it'll be sealed).
Try leaving multi meter on it (better with an analogue one) and watch it while your eating your dinner/beer o clock.
Have seen terminals crack internally, so if you wiggle it really hard you might see your voltage drop
BrickMan-
Did as you advised and all was fine, so decided to track the loom. It was the loom. Frayed wires that are too close to the frame and snorkel, so I imagine it was all the vibrating and movement that eroded the casing.
All good now and bike is happy as larry.@jambon Thanks for the heads up. Needing some gauntlets after losing mine. might head up there this week.
Chak
Yep. Showing 12.96 on the meter. However, when the trickle charger is in, it keeps giving a fault reading.