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]
MacBook Air Apple incorporated several features in the design of the MacBook Air, such as the reduction of lead to make it more environmentally friendly. The MacBook Air contains no BFRs and PVC wiring, meets Energy Star 5.0 requirements, has a recyclable enclosure, and is rated EPEAT Gold. Its display is made from arsenic-free glass, and contains no mercury.[7][32] To reduce the computer's size and weight, several features were sacrificed. It was Apple's first notebook since the PowerBook 2400c without a built-in removable media drive.[33] It also omits a FireWire port, Ethernet port, line-in, media card slots (except the 13" 2010 through 2015 models, which have an SD card slot), and a Kensington Security Slot.[34]