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1. "MAh" is the unit of battery capacity, and its Chinese name is milliampere hour (for convenience when measuring large capacity batteries such as lead-acid batteries, "Ah" is generally used, and the Chinese name is ampere hour).

1mAh=0.001 amperes * 3600 seconds=3.6 amperes seconds=3.6 Coulombs

2. Coulomb is a unit of electricity, not the basic unit of the International System of Units, but a special unit of the International System of Units. 1 Coulomb=1 ampere second.

The amount of electricity transported by 1A current within 1 second, i.e. 1C=1A · s.

3. Power calculation formula: P=UI. The unit of P is watt W; In pure resistance circuits, according to Ohm's law, U=IR can be substituted into P=UI to obtain: P=I * IR=(U * U)/R

1、 The most direct algorithm:

1. Obtain the current of the electrical equipment first

2. Divide the battery capacity by the current of the electrical device, and the result is the usable time

For example:

A 3000mAH battery with a rated voltage of 5V supplies power to a consumer device with a power consumption of 2.5W and a voltage of 5V. Its theoretical usage time is:

I=P/U=>2.5w/5v=>0.5A=>500MA

3000mAh means that 3000MA current can discharge for one hour,

3000/500=6 hours

2、 By using the Coulomb algorithm of charge quantity

C=IS=>3A * 3600s=>10800c Coulomb (charge)

10800c * 5v=54000w electrical energy

54000w/2.5w=21600/3600s=6h

If you input the current according to the device you provided, it can supply approximately 3000/(1000+1000)=1.5 (hours) of power. The input of both devices you mentioned is 1A, which should be the current that the adapter can provide. The actual working current of the router and cat is not 1A, so the power supply may not last for more than 1.5 hours.

The calculation of battery working time is as follows:

Battery working time=battery capacity/battery rated power.

The battery capacity and rated power can be read from the battery manual, but the power of the battery is not always equal to the rated power. In the initial use, it will be slightly higher than the rated power, and later it will be lower than the rated power, so the working time will also have some deviation.

Rated power refers to the power of an electrical appliance during normal operation. Its value is the rated voltage of the appliance multiplied by the rated current. If the actual power of the appliance exceeds the rated power, the appliance may be damaged. Under normal operating conditions, the output power of power equipment or the input power of energy consuming equipment. It is often measured in kilowatts. It also refers to the power that machines produced by factories can achieve during normal operation.

This calculator calculates the working time of the battery based on its capacity and load.

Among them:

IBAT (maximum value) is the maximum battery current, which is provided in the RTC data.

IBAT (typical value) is the typical battery current defined at+25 ° C and nominal power supply voltage, and this parameter value is provided in the RTC data.

Estimate the working time (days and years) of the backup battery using the formula Ah/A, where Ah is the battery capacity in ampere hours and A is the load current in amperes.

According to the Arrhenius model, calculate the working time of the backup battery considering self discharge of the battery:

Estimate the number of hours and activation energy (EA) before 1% failure (TTF) through accelerated life testing. As the operating temperature increases, the self discharge of the battery will significantly affect the overall working life of the battery.

In any case, assuming an activation energy of 1eV, the following table provides the TTF of several common batteries. When calculating, it is assumed that the stress temperature (T2) is+110 ° C (+383 ° K). Note that different manufacturers and battery model numbers may have different 1% TTF, which is related to manufacturing tolerances. Please contact the battery manufacturer for the reliability data of the actual model.

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