Hi Aaron,I'm in Australia, I ordered the battery from China. I charged it up a few times only. Back when it happened, I didn't know if it was the motor or the battery that was at fault. Its only that I found your posting that I realised we have the same problem. Screen shows all of its display for a few seconds, then turns off. I cant send it back, so I am stuck with it (impossible to send Li batteries, no one in Australia will handle big Li batteries)
Just a thought that you may have been very unlucky !
My "pattern" Yamaha battery is still working fine and has done for the last 18 months.
At the moment you have a bike that's useless and if you are certain it's the battery the only possible way forward I can see is to bite the bullet and buy another Chinese battery.
I realise it a gamble but if it comes off you'll be a very happy rider.
All the best.