Battery does seem to last a bit longer though. I am not sure this worked for me, it appeared as though my phone was turning on, then it stopped. I have an Htc Droid DNA and when I emailed HTC about battery issues they told me to turn off phone, charge for at least 20 mins, then while the phone is off and still plugged in, press and hold power and both volume buttons for 15 seconds. Battery life The nubia Red Magic 6R is powered by a 4,200mAh battery - a reasonable capacity for the 6.67' display and the flagship Snapdragon 888 chipset. While the X10 has an extra 100mAh up its sleeve compared to the Desires 1400mAh battery. Otherwise to calibrate you need to contact your manufacturer if you cannot follow the method above. Well, the HTC Desire is as close to that magical 'ad phone' Ive ever seen. However, if this is the case you would see an error message saying. Basically if your phone needs rapid charge, but your cord broke so it only charges the speed of a normal usb charger, it may take awhile to charge.

My charger broke one time ( it was one of the rapid charge mini usb cords.). Well depending on which phone you have, it might be your charger.

Htc magic battery life