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skinny-
I'd try and go for a decent ride - maybe an hour(?). Then Optimate it for 48hrs.
My hunch is it's fucked. But that should give you your best shot.
Are there any know issues like it requiring high cranking amps? My Triumph has this so as a workaround I put a manual button on the starter which has worked provided there is a half decent amount of juice.
hugo7
How long was it on the optimate for?
Probably not applicable to you but sometimes taking the battery off the bike and charging indoors in a more stable temp works better. But that's more for cold than hot.