Why isn't moto 360 2nd gen holding a charge?

Hi I have been having troubles with my Moto watch. I finally found it after a few months and it will not hold a charge for the life of it. It takes the whole day just to get to 60 present I even bought a new doc. Still nothing. And if I charge it over night it just shuts down and won't charge at all Idk what to do please help!