Pro Android Apps Performance Optimization

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 ...