20S Evo is not charging / Not Switching On

Its not one year old and hardly used. I bought it as a 20S EVO pair. It was working perfectly initially and it was kept in shelf for months. When I  took for charging , it was not charging and not LED light glowing above charging point. I tried to connect to laptop and still no use. Any help on this,

Other one is working perfect both are handled pretty same way. 

How to check whether its in warranty or not. 



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