Fenix 5 Charging

I have a Fenix 5 Plus, which I have owned for the past 3 years, I haven't been wearing it a whole lot due to losing the charger for it. I recently got a new charger for the watch, and am now trying to get it to charge but it wont. At first it showed the charge Icon. Yet after 30min I was unable to get the watch to turn on. I have put it on a wall block, and plugged it in but the only thing that shwos up is the Green tirangle then it turns off. What is the issue here? and is there a fix?