# How much is 10000 mAh power bank capacious,

Are you going to buy a battery for your smartphone, but have you heard that the capacity declared by the manufacturer is often not true? In this article, we will figure out which rumors are true and which are not, and whether 10000 mAh power bank is good.

## What is 10000 mAh power bank?

The most important criteria for choosing a portable battery is its nominal capacity – the very value that will allow you to estimate how many times you can charge your smartphone, tablet, speaker, and other devices with it.

Let us dwell on this point in more detail, because not everything is as simple as it seems at first glance. I took the volume of the battery, divided it by the volume of the device’s battery and got the number of charges. In fact, this figure will differ and significantly.

If you take any Power Bank, you can see large numbers on it: 5000, 10000, 20,000, etc., which indicates the nominal volume of the battery. Many believe that it is this volume that can be compared with the battery capacity of your smartphone or other device.

Nevertheless, in fact, the real volume is much less, as a rule, it can also be seen on the charging case or its packaging. This time the manufacturer indicates it in small numbers.

Therefore, when choosing the capacity of the Power Bank, it is necessary to look for exactly this value.

## Is 10000 mAh power bank good?

Many people think that I am deceiving them, that the store and the manufacturer deliberately indicate false information. In fact, everything is different. Let us figure it out.

For a better understanding of what is 10000 mAh power bank, consider an example.

- For example, let us take an external battery Xiaomi 10000 mAh. In fact, this power will not exist, since this value is just data from measurements carried out in ideal laboratory conditions. In addition, it will actually be different.
- Further, it should be noted that the power of the external battery is the power at a voltage of 3.6-3.8V. However, we know very well that almost all smartphones and tablets are charged at 5V. Accordingly, in order to calculate the capacity at the output, you need to convert 3.7V to 5V, as well as other components affecting the efficiency (efficiency) of the battery: the quality of the batteries themselves, elements for converting current, conductive elements, etc. For manufacturers of well-known brands, the efficiency can reach 90-95%. We will not go into the details of the calculations, say that on average you need to multiply the rated power by 0.6-0.7. That is for a 10000 battery, the real volume will turn out to be = 10000 mAh * 0.6 ~ 0.7 = 6000-7000 mAh
- But that’s not all. The charge controller inside your smartphone or tablet also contributes to “wasting” the precious energy poured into the gadget, turning some of it into heat. Have you noticed that your gadget always heats up a little while charging – this is exactly what it is!

Considering this indicator, we can safely subtract one more tenth from our coefficient, and we get it = 0.6

Based on all of the above, you can derive a formula to answer the question: «How many times can you charge your device from an external battery?»

Number of charges = Nominal volume of external battery * 0.6 / Battery capacity of the device.

For example, for a 10000 mAh battery for a smartphone with a 3000 mAh battery

10000 * 0.6 / 3000 = 2 times

Those. The result shows that instead of three times, a smartphone with a 3000mAh battery can only be charged twice! Is 10000 mAh power bank good in that case? Depends on the battery capacity of your smartphone and your personal needs.

Thus, it is clear that there is no deception, but when choosing an external charging, you will have to manually calculate its real volume, if it is not specified by the manufacturer.

It should also be remembered that the batteries operate in different modes, for example, with fast charging, 1A or 2.1A, etc. With an increase in the output, the battery is discharged faster and, accordingly, the capacity in this mode will be less. On the packaging, the manufacturer indicates information with the current parameters at which different capacities are issued.

## How much does 10000 mAh charge?

More and more requirements are imposed on modern smartphones, in particular, battery life and charging speed. If everything is clear with the first one, increase the volume of the battery, increase its efficiency, optimize the energy consumption of the smartphone. Then they began to understand the second one not so long ago, and every year newer technologies appear that allow increasing the charging speed several times.

## Accordingly, requirements are imposed on chargers for fast charging.

The simplest indicator for choosing is the current strength (1A or 2A, 2.1A) indicated in the characteristics, this parameter is intended for standard devices with a standard charging mode. 1A – for devices with a low battery volume indicator, 2A with a battery of 2000 mAh or more.

It will be more difficult to define the function of fast charging. Let us just say that here, in addition to the current strength, the voltage also changes. Usually, fast charging in a smartphone is indicated under the Quick Charge characteristic, indicating its version 1,2,3,4 … or indicate the modes of output current parameters.

## Summary

Let us summarize. In 100% of cases, the real capacity of the external storage battery is less than the nominal one. Moreover, as a rule, this is not a fraud on the part of manufacturers.

To determine how much is 10000 mAh power bank capacious, the nominal capacity should be multiplied by the factor specified by the manufacturer, or on average by 0.6. If the battery of your smartphone is 3000 mAh or less, then the capacity of the power bank will be enough for two full charges. If more than 3000, then, accordingly, you can fully charge only one time. Whether this is enough or not is up to you.

In any case, we strongly advise against buying external rechargeable batteries at too low a price. If the price is too low, it will mean that the power bank is made of low quality parts, which will significantly affect its real capacity. Then the coefficient may not be 0.6, but, for example, 0.4 or even 0.3. That is, instead of 10.000 mAh, you get only 3.000 mAh. In addition, the shelf life of such a product will also be much shorter and it will fail faster.

As the saying goes, the miser pays twice. So do not go for too low a price. Make your choice wisely and trust only trusted manufacturers.