How to Choose an External Battery for Smartphone, Tablet, and Laptop and Avoid Common Mistakes When Buying

Most smartphones hold a charge not more than a day, and the power bank won’t help to stay without communication and Internet at an inopportune moment. As a result, you can’t place a live bet via 22Bet or contact your relatives when you need them. To choose a good portable battery, you need to consider several factors: capacity, weight, connectors, supported types of charging. Here is how to buy the right powerbank and what to pay attention to in the first place.

How to Determine the Volume

Capacity is the first thing you need to decide when choosing a power bank. It determines the size of the external battery, as well as what devices can be charged on the road and how many times. The manufacturer usually indicates the capacity in milliampere hours – mAh.

The stated capacity of power banks very rarely corresponds to the real one. For example, a 20,000 mAh battery will give only 17,000-18,000 mAh to connected devices, and not always. But this is normal: part of the resource is inevitably dissipated in the form of heat, and part is spent on voltage conversion.

Compact Power Bank

The 3000-5000 mAh models are convenient to carry with you all the time. They are small and weigh 100-150 grams, but they are only enough for one or two smartphone charges. For a tablet, they aren’t enough at all.

Most low-capacity batteries are inexpensive, so they rarely have useful features like fast charging. But among them there are specialized models with MagSafe, which “stick” to the back of the iPhone and charge them without a wire.

Standard Power Bank

The most popular format for external batteries is 10,000-15,000 mAh. These devices weigh about 200 grams: in a backpack almost do not feel, but in a pocket or small handbag to carry them is not so convenient.

But one battery charge is enough for three full charges of most smartphones. Or a few weeks of intermittent recharging if you don’t plug in for long periods.

Large Power Bank

For those who don’t have a hard time lugging around an extra 500-700 grams, 20,000-30,000 mAh external batteries will do. They are enough to charge laptops for a long time or not to depend on outlets for a week while traveling.

Apple laptops and many recent Windows models support Type-C charging. But not all power banks are suitable for charging laptops: you need to pick up a model with an output voltage of 15 volts or more at least one of the connectors.

Travel Power Bank

For travel in a car, there are on sale external batteries with conventional 220V outlets and a capacity of over 100,000 mAh. From this you can not only charge a tablet and laptop, but also power a desktop PC with a monitor and all peripherals. Or a mini-fridge during a picnic.

Such a unit weighs correspondingly, three or four kilograms, if not more. You can’t carry it in your hands, but it takes relatively little space in the luggage compartment and it may be indispensable far from civilization.

Which Manufacturers to Trust

When choosing a power bank should give preference to familiar trusted brands or specialized manufacturers who have been in the market for many years.


Most manufacturers of mobile electronics also produce accessories for it. Portable batteries of “big” brands usually cost more than analogues of less well-known manufacturers. But about the quality of components and compatibility with devices of the same brand you can definitely not worry:

  • Samsung.
  • Xiaomi and Redmi.
  • Huawei and Honor.

Major Accessory Brands

There are several influential companies that develop flagship accessories in collaboration with brands like Apple and Samsung. They use quality components and pay a lot of attention to design, so their devices are not from the budget:

  • Anker.
  • Belkin.
  • Baseus.
  • Rombica.

What Features Are Useful

Fast Charging

A high-capacity power bank can take six to seven hours to charge, and with fast charging you can cut that time in half. But it’s more important to be able to quickly “recharge” your gadget on the go and not have to walk around half a day with a cable sticking out of your backpack. There are several types of fast charging, so it is important to choose a power bank that is compatible with your smartphone.

Charge Indicator

Shows how much charge is left. The simpler models use a light indicator, while the more expensive power banks place a small screen showing the external battery charge as a percentage.

Wireless Charging

Some power banks have a built-in induction coil. This allows you to charge Qi wireless charging smartphones by simply holding the gadget against a specially marked pad. The power is less efficient and the smartphone charges slower, but it does away with the wire.

Connect multiple devices simultaneously. A powerbank with two or three output ports can simultaneously charge multiple smartphones, watches, headphones, or other accessories. Usually, the speed drops noticeably when charging in parallel to avoid overheating the battery.

Through Charging

Not all power banks can simultaneously charge themselves and give energy to another device. But sometimes it can be useful: for example, to avoid occupying several outlets at once.

Overload Protection

Powerbank will last much longer if the manufacturer has taken care of battery protection inside from overheating, short circuits and deep discharge. Such details are not indicated by all stores, but the manufacturer’s website and reviews have this information. All modern power banks of famous brands have all types of protection by default.

Charging With a Microcurrent

Wireless headphones and fitness trackers are not recommended to charge with current of high power, it’s bad for their batteries. Most quality power banks can recognize such devices and supply power in a suitable way.

What You Shouldn’t Overpay for

Moisture Protection

Such power banks often have a more massive body and weigh more than usual, so they are not as convenient to take with you. And recharging electronics next to water is a questionable idea anyway.


Metal looks good in the showcase, but in use it quickly gets covered with scratches and small chips. Quality plastic is lighter, it’s not as noticeable as signs of wear and tear. It’s unnecessary to refuse a good power bank in an aluminum case, but it’s better to look for a case for it.


Some models are equipped with LEDs. This can be useful for the tourist and hunter. Or for those whose house is constantly cutting off electricity. But to pull out the powerbank from the bottom of the backpack to illuminate the keyhole or quickly find the headphone that fell on the lawn, you probably will not.