My yu yureka phone only works when it is plugged in

[AC Question]

Mybphone is running the latest CM mod .So this happened out of the blue, I just rooted my YU yureka and installed lukcy patcher app. It was working fine but suddenly while i was playing pokemon go it switched off. When I tried restarting the phone it said low battery. When I plugged the charger into my phone a grey screen appeared with the charging level and to my shock I noticed it was at 54%. So I disconnected it and tried re starting but it won't start. Keeps switching off and on its own . Now I can only use it while it is plugged in. The phone has CWM recovery installed. Any advice would mean a lot..