Modern smartphones and tablets are equipped with such power that computers did not have yesterday. However, if computing power does not stand still, then the situation with batteries is much worse. In 2017, phones come with batteries that offer only 1-2 days of battery life in mixed usage. And with a heavy load, the smartphone may not hold out until the evening.

External batteries come to the rescue - Power Banks. These are compact devices that are designed with a single purpose, to accumulate charge and charge external devices. In our selection on Galagram, the top 10 best external batteries for your mobile equipment that you can buy in 2017.

1 The most capacious battery - Xiaomi Power Bank 2 at 20.000 mAh

Main chips

• large capacity at 20.000 mAh
• output 5V/2.4A
• Xiaomi manufacturer

This battery comes in a plastic case and, with relatively compact dimensions, offers a huge capacity about 20.000 mAh. High-quality lithium polymer batteries are installed inside, and its output voltage and current is 5V / 2.4A. With the 20,000 mAh Xiaomi Power Bank 2, even high-voltage devices such as the Apple iPad and even Mi Book Air and MacBook laptops can be charged.

In addition, it supports fast charging in both directions: to receive and to return. The dimensions of this monster are 135.5×67.6×23.9 mm and the weight is 330.5 grams. Not very small, but it can charge your smartphone with a 3000 mAh battery more than 4 times. With such a gadget, you don’t have to worry about autonomy at all. The average cost of such a power bank is $39.

2 solar power bank for travel

Main chips

• solar energy charging
• built-in LED lamp
• magnetic compass
• good capacity 12.000 mAh

A huge plus of this solution is the ability to charge the external battery itself not only from the network, but also using solar energy. The solar-powered Power Bank will appeal to those who travel a lot, as it is convenient to use on the road and over long distances.

In our ranking of the best, the battery is 12.000 mAh, with dimensions of 139 × 75 × 20 mm, weighing 230 grams and with a body protected from moisture. Of course, on its front side there is a solar battery for charging, and on the end there are three ports: micro USB for charging the power bank itself and two regular USB for charging external devices. Estimated price in China is $15.

3 Mi Power Bank Pro - external battery with fast charging functions

Main chips

• fast charging Qualcomm Quick Charge 3.0
• capacity 10.000 mAh
• charging via USB Type-C port

If charging speed is critical for you and you cannot wait long for all your devices in the house to charge, pay attention to the Mi Power Bank Pro battery. Its nominal capacity is 10.000 mAh, and fast charging technology is responsible for quickly charging your gadgets. Qualcomm Quick Charge 3.0.

This gadget is charged via a USB Type-C cable and has four LED indicators on the case to show the charging status. UMB Mi Power Bank Pro is offered in two colors: graphite black and feminine pink. You can buy such a battery for about $ 30.

4 Power bank with a flashlight and a protected case

Main chips

• case protected from moisture and dust
• two powerful flashlights
• capacity 10.000 mAh
• Has a carabiner to attach to a backpack

If you love wildlife, but you can’t imagine your vacation without a smartphone, it’s time to get an external battery with a flashlight and additional protection corps. This solution has a capacity of 10.000 mAh, multiple colors to choose from and advanced features like solar battery and built-in double lantern to illuminate the area.

As you may have guessed, flashlights work from the power bank itself. By the way, his body has moisture protection, so you don't have to worry if you spill coffee on it, or drop it into the lake while fishing. The output voltage here is 5V / 2A, and the weight of the battery is 290 grams. You can buy the device on Aliexpress somewhere for 15-16 dollars.

5 Powerbank with a column for music lovers

Main chips

• music playback from microSD card and smartphone
• charging gadgets
• AUX output

A true music lover always has music with him. Especially for audio lovers, Chinese manufacturers have prepared Power Bank with built-in speaker and the ability to play music. The model is called Piple S5 and offers not only playing music from a microSD card, but also charging your gadget.

Among the useful features on the body of the speaker-power bank are: a 3.5 mm audio output, a port for charging equipment, an AUX output and music control keys. You can even play melodies from your smartphone via Bluetooth 4.0. The asking price is $39.

6 Power Bank with wireless charging

Main chips

• the ability to charge compatible gadgets wirelessly
• output 5V/1A
• thickness 1.9 cm
• capacity 10.000 mAh

This type of external batteries can charge not only smartphones and tablets via a traditional cable, but is also equipped with technology QI wireless charging. With it, you can charge such small gadgets, like smart watch, fitness bracelets and more.

The capacity of this battery is 10.000mAh, the current and voltage is 5V/1A, and the dimensions are 135×75×19mm. There are several colors of this model on sale, including white, gray and black. The average cost is $ 39, you still need to pay extra for wireless charging.

7 External battery with PISEN screen

Main chips

• capacity 20.000 mAh
• presence of LED display
• output 5V and 1/2A

Another power bank in our ranking of the best is the model Pisen with built-in display for indicating and displaying various indicators. The advantage of this solution is that you know exactly how much capacity your universal mobile battery has left.

Specifically, this model has a nominal capacity of 20,000 mAh (18,600 mAh), a plastic case, a monochrome display itself, and two ports for charging smartphones and tablets. The output voltage here is 5V, and the current is 1-2A, depending on the port. The power bank Pisen weighs 475 grams and costs about 32-35 dollars.

Portable external rechargeable batteries mobile devices, which were still a curiosity ten years ago, are now very popular. But the need to use them for all people is different. It can be said for sure that the more “mobile” a person’s lifestyle is, the more he needs this adaptation.

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And if for those who relax on weekends by the river, this is just a desirable attribute, then for hikers it is already a mandatory item of equipment: being left without navigation, light and communication in a dense forest is not the best prospect. An additional battery will also be useful for frequent trips due to production needs, as well as for long trips or flights (but in the latter case, you need to make sure that they are not banned from being transported in hand luggage, the rules can change at any time).

There is a good English term for them in the world (power bank), but they have not come up with such a short Russian term for them. The most commonly used name is “external battery”, but there are also longer ones: “universal external battery”, “portable external battery”, “portable Charger". And in everyday life they are often called simply “power banks” (“power banks”). So they will be called in our review (for brevity).

Today we will conduct a mass test of eight devices with medium and high energy reserves (with a capacity of 5,000 mAh).

All of them are from different manufacturers (Chinese, of course). And although the circuitry and technical solutions here are largely standardized, the devices still turned out to be different. And they are united by the fact that they are all officially delivered to the Russian Federation. And this is a good sign: importers do not want problems with sales and claims from "retail", so they test product samples before purchasing a batch.

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And in order for the test results to be perceived correctly, I will begin the review by outlining several almost obvious postulates that are valid for all external batteries without exception:

1. All "power banks" contain a battery charge controller and an output voltage converter (since the output voltage is not equal to the voltage of the battery(s) actually used there, and it must be raised or lowered). The need for conversion (typically to a voltage of 5 V) is the main source of efficiency loss (losses on key transistors, on rectifier diodes, on the resistance of winding elements, etc.).
2. As the capacity of "power banks", the nominal capacity of the battery installed in it is indicated, and not given to the load (which is always less, since the efficiency of the converter cannot be one hundred percent).
3. The nominal capacity of the battery inside the "power bank" may not coincide with the actual one - like all radio elements, batteries have a rating tolerance. Usually no one indicates the tolerance value, but it can be taken for about +/-10% (this also depends on the integrity of the manufacturer).

From these postulates, the conclusion follows that it would be naive to hope for a full charge of the phone, for example, with a 4,000 mAh battery, using a portable battery with a capacity of the same 4,000 mAh. This can happen in absolutely fantastic cases, when the capacity of the battery installed in the “power bank” turned out to be much higher than the nominal value due to technological variation. And there is no "cheating" in this: it's physics!

A few words about determining the efficiency of devices in the "fast charge" mode (when the output voltage rises above 5 V) and the difference from the calculation in the "normal mode". In normal mode (supply voltage 5 V), the smartphone battery in most cases is charged with exactly the current that comes from outside (with small losses in the controller). But in the “fast charge” mode, the incoming power is converted to the smartphone battery charging current and voltage, which is optimal for this without harming the battery. That is, the incoming power is used almost to the maximum.

In this regard, the efficiency for the normal mode was calculated as the ratio of the given capacity of the "power bank" to its face value. If the manufacturer overestimates the capacity in the parameters, then he will ruin his own reputation by reducing the efficiency. And for the “fast charge” mode, the efficiency was determined by the transferred energy in Watt-hours (the transferred capacity was multiplied by the voltage at the output of the “power bank” in this mode).

The energy of the tested device was also determined from the nominal power bank, and the value of 3.7 V was taken as the battery voltage.

Specifications and test program

Below are two tables with the characteristics of the tested models. The first shows the parameters of conventional "power banks" (with a capacity of 5,000 - 6,600 mAh), and the second - with an increased capacity (from 10,000 mAh).

Small "power banks"

Model

Capacity, mAh

Output current, A; number of exits

Dimensions, mm / mass, g

Price, rub.

A small educational program on power bank

An external battery, also known as a power bank, also known as an additional or portable battery, is a small portable battery that can be used to charge a number of devices: eBooks, cameras, tablets, smartphones and others that receive energy using a USB cable.

This battery needs to be periodically charged from a computer or an outlet, and it is able to store the accumulated energy for a long time. This allows you to take a power bank on a trip, to study or work - it will save you exactly when there is no access to electricity and a socket.

Several batteries are located inside the external battery. They are connected to the controller board. On this board are connectors for connecting devices. Through the use of a universal USB 2.0 interface, compatibility with most mobile devices is achieved.

Power bank can have any color, size and shape - here manufacturers delight users with a wide variety of options to make it beautiful and functional. You can buy a power bank from a plastic, metal or polycarbonate case. In terms of practicality, these options are the same, only in metal cases, batteries have a heavier weight.

The greater the weight of the battery, the higher its capacity indicator. Do not purchase models that have 20,000 mAh in parameters and weigh approximately 100 g. If you need to use your smartphone while charging from an external battery, it is better to choose the most convenient and ergonomic battery.

If the battery is needed only to last the time before normal charging, then you should choose a compact model that has a low weight. Some of them even have a keychain format.

It is appropriate to mention battery cases here. In fact, they are the same external battery with identical functions. A significant drawback stands out here - the purpose is only for a certain smartphone model. There is little practicality in such a solution, so other gadgets cannot be charged.

External battery type: Li-pol and Li-ion

Often, users who are wondering which power bank is better discount the VIP of the battery used, and are distracted only by other indicators. The functionality and durability of the device will depend on the parameters of the batteries used.

Modern power banks have one of two fundamentally different types batteries:

• Lithium polymer Li-pol. A category of plastic batteries that, when manufactured, receive any shape. They outperform Li-ion in almost all respects: less self-discharge, lower losses, discharge / charge cycles for this battery from 1000 to 5000. All this affects its cost.
• Li-ion Li-ion. They differ in the form of finger batteries. With identical dimensions, they are more compact with Li-pol. This is not a particularly durable and cheap option, which is enough for about 1000 charge / discharge cycles. These batteries have higher energy loss and self-discharge, and they heat up more.

The most important indicator is battery capacity.

Everyone who is going to buy a power bank first of all looks at its capacity indicator. This characteristic of the battery is the most important. It demonstrates which technique and how many times it can be recharged. You should not chase record high rates - first you need to decide on the application scenario:

• If you need an external battery to charge your smartphone, and you rarely go on long hikes and business trips, then you can safely take a “jar” that does not have a very high capacity. Thanks to this, the gadget will be light and compact. A universal formula is used to calculate the required battery capacity: the battery capacity is multiplied by 2 - 2.5 in order to charge the device a couple of times. For a smartphone with a 3000 mAh battery, an external battery of 6000 - 8000 mAh is suitable.
• To discharge the tablet, you need to choose batteries for 10 - 20 thousand mAh. This device will weigh approximately 350 - 400 g, so you need to be prepared for the presence of additional weight in the bag.
• The largest power bank is necessary for charging various equipment or in cases where you are without access to a power outlet for a long time. In this case, it is better to choose a more powerful external battery, from 10 thousand mAh. There are even miracle batteries with a capacity of more than 20 thousand mAh, but these products are for tourists who have been away from civilization for a long time. These devices are equipped with adapters for charging a laptop.

It makes no sense to take a power bank with a capacity indicator of less than 4 - 5 thousand mAh, and in terms of cost there will not be much savings.

Manufacturers may somewhat exaggerate the actual value of battery capacity. Often Chinese little-known companies sin with this. There are cases when a capacity of 58 thousand mAh is declared in a lightweight case. When purchasing an external battery in a store, you can use a special USB battery tester to check the indicated figures. This tester is sold for 2 - 3 dollars in Chinese online stores.

It is important to remember that the manufacturer reports the value of the battery capacity, taking into account the voltage of the used built-in batteries at 3.7 V. When the gadget is connected, the energy is transmitted with a voltage of 5 V, and then again converted to be supplied to the phone with an indicator of 3.7 - 4.2 V. Due to the double During conversion, part of the energy is lost, and in some cases, losses can be 20 - 30%.

Do not be upset if a 10,000 mAh external battery charges a tablet with an identical capacity only by 70 - 80%. At the moment, this is a cost of technology and a completely normal value.

The second important indicator is the current strength

If you do not go into technical points and details, then the higher the current strength, the faster the gadget will be charged from an external battery. When choosing a power bank, it is imperative to clarify with what current value you can charge a tablet or smartphone so as not to harm the device. This information should be on the supplied charger.

• It is undesirable to take up to 1 A, but you still need to try to find such a battery. These batteries are suitable for charging simple phones.
• 1 - 1.5 A - this is ideal for charging most modern smartphones. If the current value is less, then the charging process will be annoyingly slow. If you charge a smartphone with a sufficiently capacious battery, which will also be used in parallel, then you may not see an increase in the percentage of charging at all. There is a limit to everything: it is better not to connect to the smartphone's 2A port unless you are sure that this will not damage the device.
• 2 - 4 A - option for tablets. If you need to more or less quickly charge the tablet from a power bank, then you can safely take a portable battery of at least 2 A.

There are smartphone models that have a charge controller that limits the current. For example, Sony Xperia The Z3 is limited to 1.5A, and if you connect it to a battery with a 3A connector, the current will be limited, and the smartphone will still receive only 1.5A. These safety measures are provided by the manufacturer.

The implementation has external batteries that support the fast charging function. If you use it, then the voltage increases, and the current decreases. This ensures that the smartphone is charged by 50 - 60% in 30 - 40 minutes. The exact data depends on which power bank for the phone is used in a particular case.

Due to improper storage and transportation of the battery, its performance may decrease. real capacity.

Number of ports

Often, power banks have one USB port, sometimes there are two, and models in which three or more outputs are rare. According to many users, multiple ports are considered a must.

Choose a portable battery with multiple USB ports necessary if there is a large number of gadgets and you are sure that there will be situations when they have to be charged at the same time.

From a power bank with several outputs and a small capacity indicator, there will be absolutely no sense at all. It makes no sense to pay attention to such models. If the external battery has several ports, then they can be used normally with a capacity value of at least 10,000 mAh.

Another nuance stands out. In theory, different ports are designed to simultaneously charge a tablet and a smartphone, so the manufacturer often supplies them with different current strengths (1 A and 2 A).

An indicator of 2 A is achieved when only one device is charged. Therefore, if you connect two gadgets at the same time, most likely, two ports will only give 1 A each.

How is the power bank charged?

When charging your gadgets, the portable battery loses energy. It is also subject to self-discharge. If you do not use the battery, then in two weeks it loses approximately 5% of its charge. Over time, the battery capacity decreases, especially if the gadget is actively used: in 1 year, a high-quality product loses about 15% of its capacity, and cheap models even 35%.

To control the level of charge, these batteries are equipped with special LED indicators, consisting of 3-4 bulbs. The most advanced option is to use a small display, where the percentage will show the exact state of charge of the battery.

Portable batteries according to the method of charging are divided into the following groups:

• Powered by computer only USB port.
• Receiving energy from the computer and from the network, by connecting to a conventional outlet.

Naturally, the second option is the most convenient. That is why the first type of batteries has almost completely disappeared from the market. Remember that it takes much longer to charge the product from a computer, and using the USB Type-C interface can speed up the process. In some portable batteries, charging is carried out in record time due to the special fast charging function.

An interesting option was charging using solar cells. It is too early to say that solar energy will become a full-fledged source for powering an external battery. Now solar panels are installed at the end of the device to compensate for self-discharge.

You can pay attention to the power bank with a built-in flashlight. They come in handy when hiking or when there is a power outage.

Most portable gadgets have a micro-USB interface, and manufacturers often bundle products with a universal cord. For owners of Apple gadgets and outdated equipment, models with universal adapters are suitable. Most users need not worry. They will be able to use the charging cord that comes with the smartphone.

Dozen of the most powerful: the best external portable batteries

When choosing the best power bank, you should trust products from famous brands. So there will be more chances that the real values ​​​​will correspond to the declared ones, and the battery will definitely be durable. Today, the market for portable batteries is oversaturated, there are a lot of models and manufacturers.

Manufacturers include CaseGuru CGPower, Xiaomi, Remax, Canyon, Romoss, HIPER, TP-LINK, Samsung, Monax and ASUS. Therefore, it is not easy to choose the best power bank, especially considering different user requests. Let's look at the review of the power bank, in which we will find the most interesting models.

Wireless Power Bank CaseGuru CGPower

• The price is approximately 38 dollars.
• Capacity 8000 mAh.
• Built-in Micro USB/Type C cable and Lightning adapter (for iPhone).
• Modern technology of wireless smartphone charging.
• Digital display.
• It is possible to simultaneously charge three devices at once.
• Micro USB and Type C input.
• Exit 2A.
• You don't need to buy anything, because all the wires are included!

The Wireless Power Bank is quite an up-to-date portable charger that can recharge your gadget for several days in places where there is no electricity. Using Power Bank CGPower you can increase the autonomy of your everyday gadgets by more than 1-2 days.

Of the nice additions, we can highlight a small price and the absence of the need to purchase new adapters and cables for its further operation.

Xiaomi Mi Power Bank 2 10000

• The price is approximately $20.
• Capacity 10000 mAh.
• Fast charging function.
• Metal body material, weight 228 g.
• Battery type - Li-Polymer.
• The input current is 2 A.

Xiaomi portable batteries have become a guarantee of quality. The manufacturer's goal is to create practical, durable and functional equipment at an affordable price. Xiaomi smartphones are already called Chinese Apple. In the power bank category, the company is in a confident first place and offers customers several models at once. In this option, the capacity, quality and price of the battery are maximally balanced.

Among the main advantages: streamlined shapes, the presence of fast charging, a metal case, a USB-micro-USB cable is included. Another pleasing rich color gamut and the use of protection against overheating, short circuit, overload. LED charging indicator. The guarantee of the originality of your Xiaomi will be a special code applied under the scratch strip. You can check it on the manufacturer's website.

Xiaomi Mi Power Bank 5000 is the thinnest

• The price is approximately 15 dollars.
• Capacity 5000 mAh.
• Metal case, weight 156 g.
• Battery type - Li-Polymer.
• The input current is 2 A.

This is an analogue of the previous model, only it is more compact. The device can easily be hidden in a purse or pocket, and at the same time it is capable of recharging a regular smartphone by 1-1.5 times. There is no fast charging function here, but protection against overloads, overheating and a wealth of possible colors have been preserved. When charging a smartphone with such a battery, you can continue to use the device normally.

Xiaomi Mi Power Bank 20000 - supports fast charging!

• Capacity 20000 mAh.
• Fast charging function, 2 USB connectors.
• Battery type - Li-ion.
• The input current is 2 A.
• At the output, the maximum current strength is 2.1 A.

Chiomi has created portable batteries for all needs. A true 20000 mAh beast will be suitable for users who need a large supply of power. It can charge two products at the same time.

Plastic was chosen to frame the case, since a power bank would have come out too heavy from metal. With Qualcomm Quick Charge 2.0, the external battery charges quickly, has an LED indicator, overload and overheat protection.

ASUS ZenPower 10050 mAh ABTU005

• Capacity 10050 mAh.
• Metal case, weight 215 g.
• Battery type Li-ion.
• The input current is 2 A.
• At the output, the maximum current strength is 2.4 A.

ASUS has released a good competitor to Chiomi's portable batteries. The device is clad in metal. This small external battery has an average and quite sufficient capacity value.

There is protection against short circuit and overload. Huge selection of colors, LED indicator. In order not to scratch the metal case, it is better to use a case for it.

The HIPER XP17000 power bank is one of the best!

• The price is approximately 50 dollars.
• Capacity 17000 mAh.
• Plastic case, weight 338 g.
• Two USB connectors.
• Battery type - Li-Polymer.
• The input current is 3 A.
• At the output, the maximum current strength is 1.3 A and 2.3 A.

If you are looking for a portable battery with a wide functionality and premium appearance, then this model will be an excellent choice. The skin is coated, the product is edged around with a chrome strip, a really impressive look is obtained.

The performance indicators are also pleasing, especially the current strength and capacity. According to users, there is no self-discharge. In all respects, this portable battery is one of the best today.

Xiaomi Mi Power Bank 16000

• The price is approximately 40 dollars.
• Capacity 16000 mAh.
• Two USB connectors.
• Metal case, weight 350 g.
• Battery type Li-ion.
• The input current is 2 A.

This external battery with a capacity of 16,000 mAh looks like an elongated metal bar. The main advantages include the presence of two USB outputs with the ability to simultaneously charge two products. There are several levels of protection. There is no fast charging power bank function, it will take about 9 hours to fully replenish the energy.

The product holds a charge perfectly and is assembled with high quality, as evidenced by user reviews. Beware of fakes, and a genuine gadget from Xiaomi can be checked on the official website of the company.

HIPER EP6600 is the most unusual power bank!

• The price is approximately 30 dollars.
• Capacity 6600 mAh.
• Plastic case, weight 193 g.
• Battery type - Li-Polymer.
• The input current is 2 A.
• At the output, the maximum current strength is 2.1 A.

The compact power bank has a "big-eyed" design. The external battery looks really cool. Charge indicators are implemented in a similar way. The device is compact and fully complies with the parameters declared by the manufacturer. Low self-discharge. Easy to operate, fits easily into a bag. It is identical in size to a smartphone with a 5.2 inch screen.

Canyon CNE-CPB156 is the most ergonomic Power Bank!

• The price is approximately 35 dollars.
• Capacity 15600 mAh.
• Two USB connectors.
• Plastic case, weight 440 g.
• Battery type Li-Polymer.
• The input current is 2 A.

The model has a decent capacity, considerable weight, even despite the plastic case. The product is easy to charge two gadgets at once, LED indication. When buying, you should consider whether such a brick will be convenient for you.

HIPER Zoo 7500 - the cutest poverbank)

• The price is approximately 18 dollars.
• Capacity 7500 mAh.
• Two USB connectors.
• Plastic case, weight 186 g.
• Battery type - Li-ion.
• The input current is 1 A.
• At the output, the maximum current strength is 1 A and 2.1 A.

Inexpensive, compact, light and small power bank impresses with its appearance, as the gadget is dressed in leather. If the build quality is excellent, then the presence of two ports with the specified capacity remains in doubt. Beautiful appearance it lasts for a long time, since the skin, unlike metal and plastic, is not so susceptible to scratches. The device uses deep discharge protection. It turned out to be a functional and stylish product.

Pisen 10000 is a compact and capacious power bank!

• The price is approximately 13 dollars.
• Capacity 10000 mAh.
• One USB connector.
• Plastic case, weight 270 g.
• Battery type - Li-ion 18650.
• The input current is 2 A.
• At the output, the maximum current strength is 1 A and 2 A.

Due to its shape, this cute portable battery is able to fit perfectly in a bag. Other advantages include: optimal capacity, compact size, the ability to charge both a tablet and a smartphone at the same time. The kit includes a case, and the device is equipped with two-color LED charging indicators.

HOCO B20A - power bank with two flashlights!

• The cost is approximately $22.
• Capacity 20000 mAh.
• Has led indicators.
• Plastic case, weight 500 g.
• Battery type - Li-Polymer.
• At the output, the maximum current strength is 2.1 A.

This external battery will be a status accessory, as it has small dimensions and is dressed in leather. If a power bank with a display is required, where the degree of charge will be displayed as a percentage, then this model will interest you. Equipped with two USB ports, there is a 18650 lithium battery inside. Most likely, the developers pursued the goal of creating a small but very capacious battery that will be able to recharge your smartphone more than once.

Romoss Sense 6/6 Plus is one of the most bought on Aliexpress!

• The price is approximately $25.
• Capacity 20000 mAh.
• Two USB connectors.
• Body made of ABS plastic, weight 535 g.
• Battery type - Li-Pol.
• The input current is 1 A.
• At the output, the maximum current strength is 1 A and 2.1 A.

Our review of the best portable batteries continues with a product from Romoss. This power bank is interesting with four orange battery charge indicators, two USB ports and a cord included.

Equipped with a high quality chip, this portable charger will protect your device and guarantee a long battery life. Large capacity 20000 mAh will be able to meet your daily demands. In addition, this power bank is equipped with the function of protection against overload and overdischarge, as well as protection against short circuit. Portable and handy assistant for all people on the go!

Finally, we note that in order to increase the operating time of your portable battery must not be allowed to fully discharge. It must be charged only with such a current strength, which is given in the characteristics. If there is no vital necessity, do not use the device and do not charge it at critically low and high temperatures.

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