2000 GSX-R Battery Issue

I took her out of storage a few weeks ago and had the battery on tender all winter. It started right up no issues, went for a nice 100+km easy cruise that day. I parked it in my garage and took it once over 2 weeks. Friday I try to start it and it's completely dead so I put it back on the tender and the light flashes green like its charging. This morning (Sunday) I try starting it again and nothing so I hook it up to my car battery to jump it (car was off) and it fires up like normal but as soon as I disconnect the jumper cables it dies, my battery can't hold a charge it's 1 year old, any ideas!?

Replace battery. Its done.

Also ensure your charging system is working properly too.

Possibly a dead cell in the battery.

Damn you, that's not the answer I was looking for! I had a feeling I just wanted to make sure.

Thanks guys

Generally, if she is not ridden for longer than a week - keep her on a tender.

I have a spare EverStart AGM battery. Brand new.
It's yours for a 6-pack of Guinness.