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I link my Samsung Galaxy S3 to the computer's USB port using a non-original power cord. I've found charging process very slow, so I would test the intensity whereby power cord supply energy to the phone.

There's an app for this?

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Use "Battery Monitor Widget" app from Play Store. It can monitor the current flowing through the battery while charging. I identified my Nexus 7s charger and an aftermarket charger's performance this way.

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