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Hello , I have Iphone 4 , the problem is in that when i connect the charger with , it keeps draining the battery ( on connecting charger battery drains) I check that the battery is ok..and charger also because i have another iphone 4 so…I check it by this. On My another Iphone battery is charging and charger is working. please tell me the solution of this.

Have you tried charging it while the iPhone is turned off? (Plug in first then turn off phone) Anyway, you most likely have to change the charger port to fix this problem. Additionally you can check if iTunes application on a computer recognises the phone. You can get the charging dock connector replacement from here: [linked product missing or disabled: IF182-009-1] Guide on how to replace it: iPhone 4 Dock Connector Replacement You can also try another battery as well as I have seen a faulty battery cause this issue as well. Where to get an iFixit Replacement Battery with guide: iPhone 4 Battery iPhone 4 Battery Replacement