Abstract
Consumers of mobile devices expect manufacturers to produce devices that will be an efficient source of electric energy. The batteries currently used in smartphones allow the devices to operate for several hours. Power banks extend the operating time of the device without the need to charge via a charger connected to the mains. The present paper defines first the features of power banks that are the most important for users and, moreover, what knowledge or opinions about important power bank features customers use during purchase. As shown in the survey, according to the respondents, the most important feature determining the quality of a power bank is its capacity. It has been shown in this research that the actual capacity of a power bank is circa 2/3 of the capacity indicated. What have also been investigated are the differences between the average capacities of power banks with Li-ion batteries and the technologically newer Li-Po batteries, in favor of the latter. Power banks were not differentiated according to the type of battery and charging times in the standard variant, with a voltage of 5 V. It has been shown that the smaller usable capacity of the power bank does not affect the faster charging time.
Highlights
The second decade of the 21st century was characterized by the development of mobile technologies based on devices requiring significant energy resources available without the need for frequent recharging from stationary sources
The properties of power banks, important from the point of view of the consumer, were verified using electrical tests. (I) The capacity and stored energy of the products tested were determined under actual standard conditions of use; (II) the average capacities of power banks with two types of batteries: Li-ion and Li-Po, were compared; (III) the capacities of power banks were checked under quick discharge conditions; (IV) the charging times of power banks themselves were determined; (V) the mass of each product was determined; and (VI) the parameter defining the relationship between the real capacity and the weight of each power bank was calculated
The first five brands are Li-ion power banks, and the other five of the tested power banks are equipped with Li-Po batteries
Summary
The second decade of the 21st century was characterized by the development of mobile technologies based on devices requiring significant energy resources available without the need for frequent recharging from stationary sources. Users of mobile devices expect manufacturers to produce devices that will be characterized by reliability, modern design, low weight, and an efficient source of electric energy. Meeting all these requirements is extremely difficult, especially with regard to the battery and the weight associated with it. Taking into account the current lifestyle of societies in developed countries, where access to information is required regardless of time and place, an additional source of energy in the form of a power bank will extend the operating time of the device without the need to charge via a charger connected to the mains. With the technological development of mobile devices, consumer demands on portable energy sources are growing and are not limited to the amount of useful and usable stored electric energy
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