I found a new APP to help with those charging problems!

extraclass

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Feb 13, 2011
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GALAXY CHARGING CURRENT. This app will tell you how much current is being used to charge your Samsung Galaxy Tablet or Phone. Not sure if it will work with other makes or models. The free version tells you the basic information about how many milliamps are charging and how much your battery is charged. The paid version (one dollar) will give more information and notify you if it is not charging with a minimum speed!
It told me really quick that one of my cables will not work with my Tab-3 but works correctly with my S-4 with 2 different chargers! I am not sure why!

Now you can verify if your Phone or Tab is charging fast or slow!