what type of battery is used in laptops
Lithium-ion battery For notebooks or laptops, lithium-ion cells are supplied as part of a battery pack with temperature sensors, voltage converter/regulator circuit, voltage tap, battery charge state monitor and the main connector. These components monitor the state of charge and current in and out of each cell, capacities of each individual cell (drastic change can lead to reverse polarities which is dangerous),[76][unreliable source?] and temperature of each cell and minimize the risk of short circuits.[77]
Lemon battery There are numerous sets of instructions for making lemon batteries and for obtaining components such as light-emitting diodes (LEDs), electrical meters (multimeters), and zinc-coated (galvanized) nails and screws.[5][6] Commercial "potato clock" science kits include electrodes and a low-voltage digital clock. After one cell is assembled, a multimeter can be used to measure the voltage or the electric current from the voltaic cell; a typical voltage is 0.9 V with lemons. Currents are more variable, but range up to about 1 mA (the larger the electrode surfaces, the bigger the current). For a more visible effect, lemon cells can be connected in series to power an LED (see illustration) or other devices. The series connection increases the voltage available to devices. Swartling and Morgan have published a list of low-voltage devices along with the corresponding number of lemon cells that were needed to power them; they included LEDs, piezeoelectric buzzers, and small digital clocks. With the zinc/copper electrodes, at least two lemon cells were needed for any of these devices.[7] Substituting a magnesium electrode for the zinc electrode makes a cell with a larger voltage (1.5âˆ’1.6 V), and a single magnesium/copper cell will power some devices.[7] Note that incandescent light bulbs from flashlights are not used because the lemon battery is not designed to produce enough electric current to light them. By multiplying the average current of a lemon (0.001A/ 1mA) by the average (lowest) voltage (potential difference) of a lemon (0.7V) we can conclude that it would take more than 6 million lemons to give us the power of an average 4320W car battery.