How to calculate power bank capacity

First we should know two things: voltage and current. Powerbank is also known as battery charger. But the following steps will help you check the real capacity of your power bank.

Check your power bank capacity approximately. If you just need to get how many mAh your power bank has approximately, formula below .

Losses of in each conversion .

The guide is very general, does not contain all the voltage conversion throughout the loading process and all the losses that can be generated.

USB power banks actually specify that its the stated capacity is that of the battery inside. I think this is the cheapest way to check your powerbank capacity and of course with lots of patience as well. Charge mAh in at USB 5V in and battery . Then note the full charge duration of the powerbank.

Once you got the duration and the two Amp readings you can calculate the mAh.

Currently most power banks are designed with 5V 2A . There are kinds of power bank in the market , The prices of some power banks vary with the brand , capacity , function and other. Then , We want to check the capacity is as saying. Even though using the same charging metho the charging time may be differ due to environment,temperature, power flow and etc.

Ah mean milli Ampere Hour, the capacity of the power bank is measure with mAh. At very beginning we have to know what is mAh—it means milli Ampere Hour which can be used to measure the capacity of the power bank. From the above calculation we would easily see that with the same battery capacity , the larger input power bank has, the quicker it is charged.

V then we can calculate the required amperage for the battery as: Amps = 5. Power bank charging time calculation.

Calculate the number of charging cycles for your specific device. Formula for Number of Charging Cycles. As for the energy or power stored in this portable charger, that is what we normally call “ CAPACITY ”, which is measured in mAh, the abbreviation of mili ampere per hour.

Most power banks list their capacity in mAh (milliamp-hours) and not Wh (watt- hours). The charging time basically depends on the charger you use. Oozing style with an elegant and highly portable aluminium- alloy design, the Xiaomi packs useful capacity and still represents extraordinary value.

Find out more in our Xiaomi power bank review.

Re-charging time depends on the capacity of the powerbank , remaining power in the powerbank and the power supply. An estimate of power is consumed . Now its time to solder the batteries.