Samsung Galaxy S5 has battery or charging problem

1.The first thing to do is make sure that you are using the Samsung charger and cable that came with the S5. Other chargers may have different voltage ratings and they won’t always work with the S5. Give the phone a good 30 minutes plugged in before you try to turn it on.

2.Try changing the wall socket and using the cable and charger on a different device to make sure there are no faults there. Try a different charger and cable with the same rating.

3.Try plugging the S5 into a USB port on your PC or laptop. Bear in mind that it will charge more slowly from a USB port than from the charger plugged into the wall.

4.Take a look at the charging port, blow into it or use compressed air to make sure there’s nothing blocking it.

5.If it still isn’t working then you may have a dead battery or a broken charging port. replace the charging port yourself. Here’s an iFixit guide, but it’s a complex procedure.