A long time ago, the mobile phone is no data cable, not plug the mobile phone can be charged, a long time ago, the mobile phone is needed to pull the battery out, and then put it on the charger to charge, then this time you need the mobile phone off, if you do not want the mobile phone off, you can back two batteries, now it is much more convenient, only need a battery, and it is a data cable charging, Never turn off
In the past, when the mobile phone was not an all-in-one machine, they would buy a spare battery, charge it with a universal charge, and bring it with them to prevent the mobile phone from running out of power, of course, when buying a mobile phone, there is also a charging cable, but it is far from the speed of charging now.
You could take the battery off and charge it with everything
Old phones would take the battery off and charge it with a universal charger