Sanity check- when you try to revive it with the optimate, make sure it's not still connected to the bike. Smart chargers often won't go into their high-voltage desulphate mode if they detect that the bike's still in the vehicle just in case the electronics are damaged. Disconnect it or remove it from the bike and try it.
Well connected the optimate to the battery, it came up with the yellow charging light. Humm, We'll see what it does. Battery already removed from the bike so no neg/pos/sparkie issues to worry about.

Val.
