EC reset on Chromebook for devices that will not turn on or charge

I am not sure how these devices get into this kind of battery safeguard mode but when it happens the battery will not charge nor come on. I work for a school system and I used to send Asus chromebooks back to Asus when they would not charge or come on. They would be returned with no parts replaced and a note saying that an EC reset was performed. I called Asus and found out what an EC reset was and they said to perform one you hold the power and refresh button down for 10 seconds. Well this wasn't working and we had another tech that accidentally stumbled onto this method and it has worked for 100's of device of every manufacture in our schools. Give it a try of your chromebook will not turn on or charge.