If its worked fine for the last year and your riding hasn't changed, didn't leave the lights on(killed the battery by accident), its likely toast.
You can pull it, it should be fully charged and THEN LOAD TESTED, but most likely its done.
Where you are, I suspect the bike is laid up for most of the winter. I'd PU a battery tender anyway to fully charge up whatever battery you have.
Should you order a battery on line, it MUST be trickle charged BEFORE being used in the bike.
It comes about 80% charged, the additional charge tops it off and you'll get longer life out of your battery.
Count on 6-8 hours at 1.25 amps, trickle charging, to get a new battery fully charged.
NOTE, If your cig lighter is hot all the time, you can plug your charger into that and charge the battery W/O pulling the tank.
I'd stick with the OEM Yuasa which you can at Amazon(again, you'll need a charger or borrow one).