The most common measure of battery capacity is Ah, defined as the number of hours for which a battery can provide a current equal to the discharge rate at the nominal voltage of the battery. The unit of Ah is commonly used when working with battery systems as the battery voltage will vary throughout the charging or discharging cycle.
The energy stored in a battery, called the battery capacity, is measured in either watt-hours (Wh), kilowatt-hours (kWh), or ampere-hours (Ahr). The most common measure of battery capacity is Ah, defined as the number of hours for which a battery can provide a current equal to the discharge rate at the nominal voltage of the battery.
Do Battery capacity and battery life are two important factors to consider when choosing a battery for your needs. Battery capacity refers to the amount of energy a battery can store. It is measured in units of watt-hours (Wh) or milliamp-hours (mAh).
Some of the popular battery sizes are AA, AAA, 9V, CR2032 (coin cell), etc. These sizes are standardized by IEC (International Electrotechnical Commission). In this article, we will discuss different battery sizes and their applications. The fundamental parameters of the battery sizes and the comparison between them are given in the table below.
Both primary and secondary batteries are available in C size. Alkaline, Lithium, NiMH, and Carbon Zinc are available in C size among which alkaline and lithium are the most common. The life and capacity of C-size batteries slightly vary with respect to the battery chemistry.
Using Faraday’s constant, which gives the number of Coulombs for a mole of electrons (F = 96,484.56 C/mol), the total available coulombs (charge) can be determined for the battery. Since the battery capacity, when described in Ah is a measure of the total stored coulombs (Amps are C/sec), then the battery capacity can be determined by the equation: