You do not need to use battery. However, if you do use the battery, your charging habbits have a bearing on the battery life. For example, short recharge cycles may adversely impact the life. I think it is better for battery to drain fullly and recharge fully to use.
you must use a battery charger that contain a USB port and connect it to the laptop's USB port
Depends on the brand and model laptop. Can be anything from 10 to 16 volts. You must buy a battery that is specific to your laptop.
remove the battery
transfer/movement of electrons
If you was to rough it out then you must have robust laptop, spare battery . IBM Lenovo think pad should be good choice. You must carry good sleeve and laptop bag.
This depends upon the application. For most home appliances and industrial machinery, alternating current is the best electric current. In most computer electronics, alternating current must be converted into direct current.
Unless you have a recent Mac, the USB port does not have enough current to change the huge iPad battery. You must use the AC adapter that came with the iPad, or other compatible power supplies.
The relation between electric current and drift velocity is that they both happen to involve electrons moving opposite of the electric field. The electric field must also have a conductor.
When people buy a laptop, battery life and maintenance has become the important part. Then how to maintain the battery? Your new laptop battery comes in a discharged condition and must be charged before use (refer to your computer manual for charging instructions). Upon initial use (or after a prolonged storage period) the battery may require two to three charge/discharge cycles before achieving maximum capacity.
Resistance
coils of wire, iron, and electric current
In order to change an electric current, you must first change the conductor, doing so will change the flow of atoms which will change the electrical discharge.