Why isn't my phone charging?

[Windows Central Question]

Phone not charging

battery indicator says its charging but the phone will not charge and the critically low battery warning comes up

 

[ssapre]

Re: Phone not charging

Did you try charging with a diff USB wire or from using a laptop instead of power?

 

[xandros9]

Re: Phone not charging

Is it doing any serious heavy lifting at the time? (power consumption could be higher than the power coming in.)

I noticed that when I was doing some heavy IM'ing while messaging with IM+/FB Messenger while wirelessly charging.
Also when playing heavy games with my Surface Pro while using the insufficient Surface RT power supply.

How many amps is the charger being put out?