micromax a111 not charging problem topic

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I have a micromax a111 canvas having charging problem.
I have done already the following:
1. Did factory reset
2.Changed the battery (but found there is no problem with batteries)
3.The OS android 4.1.2 (original) copied again
4.The charger pin replaced
5.Tried with MMX charger and other chargers also

The phone sometimes charges well and most of the time shows charging, but never charges. The battery percentage suddenly drops hugely.
The problem still persists and dont know what to do with it.

the usb port (charger pin) of the device was replaced by service centre. It has no issues. When Charger is attached, it works fine, it shows the power on led (red).
Except that the device is working fine. All apps work fine. Checked for virus,malaware using 360 app. It shows system is in a fine condition.
Only problem is battery is not charged properly. Sometime it charges and shows some percentage say 80% or so. But when the system switched off and switched on again, the battery % suddenly drops to very low % say 20 or 15%.

This is the problem I am facing and other than this there are no issues with the system.

Would like to know what will be root cause? In my perception it should be some hardware issues rather than software issue.
Pls advice

xda-developers


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