( Electrical engineering : Circuits , Electrical power , Computing and control )
Battery life has become a key selling feature of portable equipment, as users can expect today's system to operate for a much longer time than one purchased
just two years ago.
Lithium-ion cells are very popular for portable equipment such as notebook computers, video cameras, and cell phones.
Portable equipment is electrical equipment that can easily be moved from one place to another while in
operation or while connected to the supply.
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