First try a different outlet. If the outlet is not the issue, then try using a different charging cable. If the outlet and the charging cable are fine then the micro USB port is probably broken and needs to be replaced.
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Rifer to https://www.ifixit.com/Wiki/Samsung_Galaxy_Prevail_2_Troubleshooting for more information.
First try a different outlet. If the outlet is not the issue, then try using a different charging cable. If the outlet and the charging cable are fine then the micro USB port is probably broken and needs to be replaced.