This link provides more information on the subject.įinally, knowing the Peukert capacity and Peukert exponent you can calculate the discharge time for a given discharge current. R – the hour rating (ie 20 for 20 hours, or 10 for 10 hours etc) you can calculate the Peukert capacity using the following formulaĬ – the specified capacity of the battery (at the specified hour rating) Knowing the hour rate of your battery, its specified capacity and Peukert's exponent. The same battery discharged at 0.5C provides 500mA for two hours. For example, a battery rated at 1000mAh provides 1000mA for one hour if discharged at 1C rate. A discharge of 1C draws a current equal to the rated capacity.
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If not specified, manufacturers commonly rate batteries at the 20-hour discharge rate or 0.05C.Ġ.05C is the so-called C-rate, used to measure charge and discharge current. This is known as the "hour" rate, for example 100Ahrs at 10 hours. Battery manufacturers rate capacity of their batteries at very low rates of discharge, as they last longer and get higher readings that way. Batteries are rarely specified with Peukert capacity. Peukert's capacity is the capacity of the battery measured at 1 amp discharge rate. Peukert's exponent can be calculated from these graphs or tables, or by running two discharge tests at two different discharge rates. But sometimes they have tables giving different run times at different discharge rates, or a graph of discharge rates against run times. Many batteries do not have Peukert's exponent available in specification. Peukert's exponent changes as the battery ages. Peukert's exponent is determined empirically, by running the battery at different discharge currents. Peukert's exponent shows how well the battery holds up under high rates of discharge – most range from 1.1 to 1.3, and the closer to 1, the better. The formula for calculating it is known as Peukert's equation, and the important number, unique to each battery type, that is put into the equation in order to perform the calculation is known as Peukert's exponent. Thus the effect is now known as Peukert's effect. This effect had been known for many years but it was Peukert who first devised a formula that showed numerically how discharging at higher rates actually removes more power from the battery than a simple calculation would show it to do. However, battery capacity decreases as the rate of discharge increases.
![charge time calc charge time calc](https://thegadgetflow.com/wp-content/uploads/2020/11/FoneDrop-Limitless-Phone-Case-ecosystem-01.jpg)
![charge time calc charge time calc](https://hi-static.z-dn.net/files/ddc/54fdd7aac65f8c0608bce16255b877de.jpg)
for a given capacity C and a discharge current I, the time will be You may think that calculating how long a battery will last at a given rate of discharge is as simple as amp-hours: e.g. I'm not an electrician, so please pardon me for any mistakes.īattery capacity is a measure (typically in Amp-hr) of the charge stored by a battery. Everything below was created after spending several hours searching and reading the internet.