Why Doesn T My Laptop Charge When Plugged In. When about 50 charge left I connected the power cable with the laptop. All is up to date.

If its removable take it out and press and hold down the power button for around 15 seconds. Turn off the laptop and turn it back on after 30mins. Battery charging does not start until the Power Meter shows that less than 95 of the total power remains.
Restart the system and press f2 key to enter BIOS - check the adapter status in BIOS with and without the adapter plugged in.
Turn off the laptop and turn it back on after 30mins. Fixing the laptop computer plugged in however not charging problem. It has been proven to be true that the faulty AC adapter is responsible for the Dell plugged in not charging issue. This means that your Surface does not detect the power supply and is also not charging the battery.
