January 2012
Intermediate to advanced
282 pages
7h 4m
English
Content preview from Pro Android Apps Performance Optimization
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Batteries
Different devices have different capacities. Battery capacity for phones and tablets is often measured in mAh—that is, milliampere-hour. Table 7–1 shows the capacities of the devices mentioned in Chapter 2.
NOTE: The ampere, named after André-Marie Ampère, is an SI unit of electric current and is often shortened to “amp.” One ampere-hour equals 3,600 coulombs, and therefore one ampere-second equals one coulomb, and one mAh equals 3.6 coulombs. The coulomb, an SI unit named after Charles-Augustin de Coulomb, is rarely used in the descriptions of consumer products.
The fact that tablets use batteries with much larger capacities is a ...
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