Cf MAXX battery suddenly stopped working

Hey I just wanted to know if anyone of you have this problem. My cf MAXX battery is paired with the Atlantis mega v2 (idk if there's a difference between normal and mega but mine was the mega bundle I guess) and it has worked great for a good.... 6 months? Now out of the blue it stopped working, I know it's the battery cuz I tried using the tank on my Atlantis v1 battery and it worked fine. When I try to fire it on the v2 it just makes a buzzing sound but Will fire if I'm pressing the button as I'm screwing the tank on.. Weird. Does anyone have any idea if this is fixable? Do I have to get a new one?
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