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My iphone6 battery is not charging and showing zero voltage. At the beginning it was in normal 3.7 voltage . When i switched on the screen stuck with apple logo so i tried to charge . Can i charge the battery or is it permanently damaged?

A battery that measures 0V, measured directly on the battery connector, is usually indicative of a dead battery. If you have access to current limited DCPS, you could try to force charge it yourself to see if the problem is with the battery or not. Dave Jones has a good video in this. Don’t attempt this if you aren’t comfortable and never leave it unattended. Otherwise, you may have a defective charge circuit in your phone. This can be repaired by an experienced micro-solderer.