I'm sorry to hear about your bike not starting BUT I truly believe, that many of us just learned about the difference between a battery "trickle charger" and a battery maintainer... Very interesting knowledge to know....
I do have a brand new Yuasa motorcycle battery , sitting in my office as we speak, [I have not mixed the acid in battery as of yet]
Ronnie
'Trickle charger' doesn't ever reduce output, shich is what kills battery.
'Maintainer' will reduce it's output when battery is charged.
Some 'maintainers' will not start to charge a 'dead' battery as the maintainer thinks that nothing is connected, or that it is improperly connected.
A trickle charger can sometimes recover a battery in this situation -- and charge it enough that a maintainer can be used to complete the charge.
I've usually found that a battery drained enough that the trickle charger recovery method is required has lost much of it's useful life, and will watch it more carefully for signs that it is time to replace.
Assuming your Yuasa battery is still in the box, it will have very good instructions for fill and initial charge.
Be fussy about following the 'stand time' after fill / before charge and 'charge rate' for initial charge and the battery will serve you better.