Apple Watch Battery Issue

Recently my apple watch has been shutting down around 30% battery life, it shutdowns completly and it won't turn on (it won't even show the "needs charging image"), when I connect it to the charger, the watch comes back on, and after starting it shows 30% battery life, when this happens, it won't go into low power mode or anything, just shutdown entirely, my watch used to hold a charge up 2 days (it'll need recharge by evening in the second day), now with this issue I can barely get 8 hours out of it, it's an apple series 2 Nike+ edition, any thing I could do?

Thanks