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.
transfer/movement of electrons
remove the battery
To create an electromagnet, you will need a coil of wire (usually copper), a source of electric current (such as a battery), and a magnetic material like iron. Placing the coil of wire around the magnetic material and passing an electric current through the coil will generate a magnetic field, turning the setup into an electromagnet.
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.
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.
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.
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.
To establish an electric current, there are two requirements that must be met. There must be a closed conducting path that goes from the positive terminal to the negative terminal. The second requirement is to have an electric circuit for the energy to move a positive test charge against the electric field.
Resistance
it has something to do with the electrical current pssing through the wires to the battery