![]() ![]() Like ampere hours, milliampere hours also refer to how much current a battery discharges over a period of one hour and indicate how long the battery will continue to operate before needing recharging. The level of amperage it takes to get the battery to zero over that time is the ampere hour rating. Manufacturers define the ampere hour rating of lead-acid batteries - like automotive batteries - by draining them down to 0% battery capacity over a specific time period. Car batteries are usually rated at 70 Ah. It helps to calculate the battery capacity for long-term backup ampere hour requirements. For some batteries, a 100-hour ampere hour rate is specified. Starting batteries are usually rated at 10 hours since they are used faster.įor industrial batteries, a six-hour rate is often specified since it is the typical daily duty cycle. Rechargeable lithium-ion batteries are rated at 3,200 mAh, meaning they can discharge 3,200 milliamps (3.2 A) in one hour. The rating indicates that the battery is discharged to 10.5 volts over 20 hours, while the total ampere hours supplied is measured. The accepted ampere hour rating time period for solar electric batteries, deep-cycle batteries and backup power systems - uninterruptable power supplies - is generally a 20-hour rate. If the rating is not specified, it usually means that the battery is a starting battery that's not designed to provide continuous power in ampere hours. The ampere hour rating is displayed on the battery. The calculation involved in determining the ampere hour rating can be understood with the following example - consider a battery that pulls 30 amps (A), which is discharged in 30 minutes:Īmpere hour = 30 x 0.5 or 15 Ah for 1 hourĪmpere hour = 15 x 5 or 75 Ah for 5 hours Mathematically, Ah is represented as the following:Īmp hour (Ah) = Current (I) x Discharge time (T) During the hour, the amount of charge transferred in is 3,600 coulombs (ampere-seconds). A simple way to look at it is: 1 ampere of current flowing for one hour. One ampere of current represents 1 coulomb of electrical charge moving past a specific point in one second.Īn ampere hour combines the amount of current with the time taken for a battery to completely discharge. Determining a battery's amp hour ratingĪn ampere is the rate of electron flow or current in an electrical conductor. But, for standard AA and AAA batteries and other small batteries used in devices such as personal vaporizers and notebook computers, the rating is provided in milliampere hours ( mAh). Large batteries are usually rated in ampere hours. The unit is a useful metric to determine the capacity of an energy storage device, such as a rechargeable battery or deep-cycle battery. Another way of saying it is that 1 Ah is the rating indicating how much amperage a battery can provide for one hour. Ampere hours - sometimes abbreviated as Ah or amp hours - is the amount of energy charge in a battery that enables 1 ampere of current to flow for one hour. ![]()
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