Your cable could be bad, try a new one, possibly MFI certified ! (Made For iPhone) Or try a known-good one.
Try a new charging brick, or a known-good one that delivers at least 5V-1A
Check your charging port, it could be really dirty or obstructed
If it looks dirty, you can take the risk to insert a thin tool and try to pry out the dirt. I am not responsible for the harm you could do to your phone !
Try a known-good battery. Replace it if your phone charges again.
Try a known-good Lightning charging port. Replace it if your phone charges again.
I know, this is a picture of an iPhone 7, check the video for the 6S on the next step.
If you are still reading, bad news, you probably have a motheboard problem !
It's probably U4500, or Tristar that's causing it, it fails very frequently on iPhones. You'll have to replace it.
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