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Showed battery 100% since Last full recharge. Now when I used for a complete day with wifi connected Switched off finally with the same 100%. Now restarting automatically when connected to charger, switches on shows 1% battery with charging sign & goes off after few seconds. What is the problem, please help?
Leave it for a good few hours plugged in to the charger but switched off, like over night or longer. It may at least partially recover, but it sounds like your battery is on its last legs and you need a new one. Get one from ifixit.com or a reputable repair shop which will give you a refund if the new battery is not up to scratch, as there a lot of cheap poor quality ones out there.
