Windows 10: Battery fully charged but orange LED is blinking

My Dell M4800 battery fully charged but the orange LED is blinking.

:)

 

Battery Won't Charge Fully

The manual says blinking orange means the laptop is running on battery mode and the battery is less than 10%.

I shut it down, pulled out the cord, then tried to hold the power button for 10 seconds but the laptop shut down before those 10 seconds. I inserted the cord and tried again with the same results. I started normally and the blinking light stopped. The battery is at 74% and charging but I suspect it won't charge fully.

I'll try a calibration then battery removal. I've been hesitant about removing the battery because it seems a bit tricky from the tutorial I watched.

 

Battery Won't Charge Fully

Be brave. *Smile While you're in there blow any dust out, etc.

 

Battery won't charge, Blinking orange battery icon.

Battery won't charge. Blinking orange icon.