Use this also on your smartphone or any similar device with a microUSB charging port. And don't forget the cables also.
Check out the many YouTube videos on tablets not charging. I was told by Samsung that my tablet did not have a replaceable battery. I could not get it to charge changing cords, adapters, etc. I found one video that said scrub with toothbrush dampened in isopropyl alcohol. I then sprayed it with compressed air. It charged to 100% in 2 hours!