Why is my phone taking so long to charge?

I have an iPhone 6 and I don't know why it always takes so long to charge. My phone died, so I plugged it in. It's been plugged in for over an hour, and somehow it still does not have any charge at all whatsoever (even though it is indicating that it is plugged in/charging). Am I doing something wrong? Is my phone broken? Why does this happen?

Added (1). My phone is now plugged in and losing charge.

The battery has failed, it needs a new one

Try this Samsung trick. If you have a laptop, plug your iphone up to it to charge. Let it run all night. Next morning, check to see if it actually took some charge. If it did get a small charge, move it to your regular charging port to finish charging. It has to have a little bit of a charge to kick it to charging mode.

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