Mobile phones are practically a necessity in today's world. With so many different brands, operating systems, and features available, it can be overwhelming to try and find the perfect one for you. And while mobile phones have become more advanced than ever, there's one persistent problem users continue to face: The battery lifeThat's where the external mobile battery.
These small devices are capable of storing electricity that can then be used to charge the mobile or other electronic deviceIf you're someone who uses their phone a lot throughout the day—going from meeting to meeting, commuting on public transport, or spending time with friends after work—an external battery might be a useful addition to your daily travel kit. It's also a near-essential accessory if you use a tablet, Bluetooth headphones, a smartwatch, an e-reader, or even a laptop with a USB-C port.
In this article, we will talk about Key tips for choosing the best external battery for your mobile phone and other devices, and we'll show you a selection of recommended models for different user profiles.
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How to choose the external battery
To choose the external battery, it is best address several key points that determine the actual user experience: from capacity and charging power to ports and design. Below, we elaborate on each of these, incorporating practical criteria used in the best specialized guides.
Look at the reputation of the brand
When it comes to electronics, reputation is everythingYou should make sure you buy from a company with a good reputation for quality, reliability, and after-sales support. Brands specializing in accessories (such as those mentioned in many comparisons: Anker, Baseus, Belkin, Xiaomi, INIU, UGREEN, Trust, etc.) usually pay special attention to the safety and actual performance of their batteries.
Some brands will sell you a great product on paper, but They won't be there to help you. If something goes wrong or they don't clearly specify details such as nominal capacity, actual power output, or protection systems, it's important to be aware of this. It's also crucial to buy from a brand with a good track record with regulatory bodies such as CE, FCC or RoHS to ensure you are purchasing a safe product that will not cause interference or electrical problems with your devices.
If a company has a bad reputation, the best way to avoid it is research other users' opinions and independent reviews. Check out comments about overheating, battery swelling, rapid loss of capacity or port failures, because these are clear signs that it's advisable to look for another option.
Check the basics: capacity in milliampere hours (mAh)
capacity is the amount of energy that a battery is capable of storingThe higher the capacity, the more recharges you can get from it. It is usually measured in mAh (milliampere-hours). The lower end of the spectrum for mobile phone batteries is around 2.000 mAh, while current external batteries commonly offer models of 5.000, 10.000, 20.000 or even more than 30.000 mAh.
However, the theoretical mAh provided by the manufacturer They do not correspond 100% with realitySome of the energy is lost as heat and in the voltage conversion process itself. A reasonable estimate for the actual available capacity is around 60-70% of the indicated capacityIn other words, if an external battery advertises 10.000 mAh, in practice you will be able to use about 6.000-7.000 mAh effectively.
Some more traditional guides recommend choosing a battery whose capacity is around 80-90% of your phone's internal battery capacity To ensure at least one full charge (for example, if your smartphone has a 3.000 mAh battery, look for a power bank close to 3.000 mAh). Keep in mind that, given the percentage of energy loss due to conversion, this practical recommendation needs to be adjusted: to achieve an effective full charge on a 3.000 mAh phone, it's common to choose a power bank of 10.000 mAh that compensates for losses and offers additional top-ups.
That doesn't mean you should automatically choose the highest capacity one you can find. If you do, you could end up with a much smaller battery. bulky and heavy of what you really need. The best thing is to find an external battery with a capacity suitable for your use:
- 5.000 mAh: for emergencies and to give your phone a quick battery boost.
- 10.000 mAh: good balance between size and autonomy; usually allows 1-2 full loads on a modern smartphone.
- 20.000 mAh: ideal if you're wearing several devices (mobile phone, headphones, smartwatch, tablet) or you travel frequently.
- 30.000 mAh or more: designed for intensive use, remote work, or laptopsThey are very powerful, but also heavier.
As a reference, the most practical thing is that the capacity of your external battery should be around 80-90% of the total capacity you need per day For all your devices. If you have a 3.000-5.000 mAh smartphone and want an extra full charge, 10.000 mAh is enough; if you also want to charge a tablet and headphones, 20.000 mAh is a much better fit.
Check the power and charging speed (W and A)
In addition to capacity, it is essential to look at the output power of the battery, which is expressed in watts (W) and is calculated by multiplying volts (V) by amperes (A). The higher the power, the faster the loading will beThis is key if your mobile phone or tablet supports fast charging.
Some important points:
- Amps (A) measure the amperage: more amperage, faster charging speed.
- Watts (W) measure the total power: is obtained from V × A.
- Most current mobile phones support between 15 and 30 W fast charging; laptops with USB-C may require 45W, 65W or more.
Many modern models incorporate technologies such as Power Delivery (PD) o Quick Charge (QC)which allow you to adapt the voltage and current to each device. If your phone supports fast charging, it's advisable to look for an external battery that also integrates it. make the most of loading timesIn the case of laptops, always check that the battery output reaches the minimum power indicated by the manufacturer of your equipment.
Check warranty and build quality
Hay lots of brands There are different external mobile batteries on the market, manufactured in different regions of the world. Each external battery will have a different warranty. The warranty period is a good indicator of product quality. The longer it is, the more confidence the manufacturer inspires. in the durability of its cells and internal components.
The other thing to keep in mind when it comes to construction is the body materials and the design. You'll want to make sure the battery's exterior is resistant to bumps, falls and scrapesand that it does not contain harmful chemicals. Many models opt for ABS plastic or metal casings, and some brands even incorporate recycled plastics to reduce environmental impact.
The best thing you can do is check the product's website to see the materials listed and safety certifications (such as CE, RoHS, or FCC). It's also a good idea Check customer reviews who have bought the battery to see what they have to say about its construction, whether it gets too hot or if the body deteriorates quickly.
Don't forget to check the type and number of ports
Although it may seem like a minor detail, it's actually very important. It's key because you don't want to buy a battery that doesn't fit your phone or that it can't charge all your devices at the same time.
Aspects to review:
- Output connector typeIt's common to find USB-A and USB-C. The current standard is USB-C. USB-Cwhich allows for greater power and bidirectional charging in many models.
- Ports of entryThe battery is usually charged via micro-USB or USB-C. It's interesting that USB-C works in both ways. both input and outputbecause it simplifies use and cables.
- Number of portsIf you're only charging your phone, one is enough; but if you want to charge mobile phone, tablet, headphones or smartwatch At the same time, it should have several ports and the power should be distributed intelligently.
If you're unsure, check the product page to see which phone and device models it's compatible with. You don't want to buy a battery only to discover it doesn't suit your needs or that one of your gadgets won't charge properly.
Design, size and weight
The design of a power bank involves both aesthetics and functionality. real portabilityHigher capacity batteries are larger and heavier, so there is always a trade-off between autonomy and everyday convenience.
If you're going to carry the battery in your pants pocket or a small bag, prioritize models compact and light (5.000-10.000 mAh, reduced thickness, less than 250-300 grams). For long trips, remote work, or outings where there are no power outlets, it makes sense to accept slightly larger size and weight in exchange for 20.000 mAh or more.
It's also worth paying attention to details such as:
- Finished antiskid that facilitates gripping.
- Corners rounded for more comfortable transportation.
- Charging indicators: from simple LEDs to digital screens which show exact percentage, output power and estimated time.
Interesting extras: screen, integrated cables, wireless charging
In addition to the basic specifications, many batteries offer extra features that make a difference in everyday use:
- Integrated cablesSome models include a USB-C or Lightning cable integrated into the body itself, preventing you from forgetting it and reducing the accessories you have to carry around.
- Digital screenIt allows you to see the remaining battery percentage, instantaneous charging power, and other useful data. It is much more accurate than the typical four LEDs.
- Wireless chargingIf your phone is compatible with Qi or MagSafe charging, a battery with integrated wireless charging can be very convenient, especially for short trips or for leaving your phone charging on the table without cables.
- LED FlashlightIt can be useful in camping trips, power outages, or emergency situations.
- protective coversSome manufacturers include a case to prevent scratches when carrying it in backpacks or bags.
Can I use the external battery with laptops and on airplanes?
More and more users want to take advantage of external batteries not only for their mobile phones, but also for laptops with USB-CTo find out if you can charge a laptop with a power bank, you need to check two things:
- That the laptop supports USB-C charging with PD (Power Delivery) standard.
- That the external battery offers a output power in W equal to or greater to that required by the original laptop adapter (e.g., 45W, 65W, etc.).
Regarding air travel, international aviation regulations allow external batteries to be carried in the hand luggagenot in checked baggage, and with a usual limit of 100 Wh capacityYou can calculate Wh from mAh using the formula Wh = V × AhMost manufacturers already indicate this on the casing to facilitate safety checks.
Best external mobile batteries
Finally, here are some of the best external mobile batteries to charge your devices, organized by capacity. These models stand out in online stores for their good value. price, capacity, loading speed and quality, and they serve as a clear reference when choosing.
10.000mAh batteries
To fully charge almost any mobile device and still have power left over for other battery-powered devices, this can be an excellent capacity for everyday use. These are typically batteries. very portable, that fit in your pocket or a small bag.
Models in this range are usually found with 1-3 output portsSome offer fast charging up to 22,5W, while others feature an ultra-thin design or even wireless charging. They're a good choice if you use your phone extensively but don't need to charge large tablets or laptops.
20.000mAh batteries
If you have many battery-dependent gadgets, you might be better off with one of these with a slightly higher capacity, which offer a A very interesting balance between autonomy and size.With 20.000 mAh, it's common to be able to charge a smartphone or a medium-sized tablet several times, or keep headphones and a smartwatch powered for several days.
Many of these models already incorporate LED or LCD screenThey offer sufficient power output to charge demanding devices and even bidirectional fast charging options. They are especially recommended if you work outside the office, travel frequently, or share the battery with family or friends.
30.000 mAh batteries or more
For the most demanding users with high energy needs, higher capacities are the best option. These batteries are designed for intensive use, professional work, photography, video, or gaming, and even to power laptops compatible with USB-C PD.
In exchange for their enormous capacity, they usually have a greater weight and sizeTherefore, they are more geared towards backpacks, briefcases, and travel than pocket pockets. They are worthwhile if you don't want to worry about finding outlets for several days or if you need to charge multiple devices simultaneously at high power levels.
Frequently asked questions about external batteries for mobile phones
How long does it take to charge an external battery?
The time it takes to charge an external battery depends on its capacity (mAh), from the charger you use and whether the battery supports it fast charging inputFor reference, a 20.000 mAh external battery typically needs between 5 and 6 hours with a charger of about 18W, although many modern models reduce these times with inputs of 30W or more.
You can estimate the time with a simple formula: Charging time (h) = Capacity (Ah) ÷ Charging current (A)Remember to convert mAh to Ah by dividing by 1.000.
Can I use my mobile phone while it's charging with an external battery?
Yes, you can use your phone while charging it with a power bank. However, keep in mind that depending on how you use your phone, this may affect battery life. affect loading speed and generate a little more heat. Using it for messaging or light social media isn't a problem; playing very demanding games or recording high-resolution video for long periods will slow down charging and cause both the phone and the battery to heat up more.
Is it safe to leave the external battery charging overnight?
In general, it's perfectly safe to leave a power bank charging for several hours, because most include overload protection systems which stop the process when the battery is full. Even so, to preserve battery life, it is recommended disconnect it when it reaches 100%. and avoid exposing it to very high temperatures during charging.
Can I charge other devices like cameras or portable game consoles?
Yes, you can charge other devices with an external battery, such as cameras, wireless headphones, Bluetooth speakers, portable game consoles, or smartwatchesProvided the cable and charging port are compatible. For more demanding devices (such as some consoles or large tablets), check that the minimum power required by the manufacturer is compatible with the battery's output power.
What do the outputs in amps (A) or watts (W) of an external battery mean?
Amperes (A) are used to measure the amperage, while watts (W) are used to measure the powerIn an external battery, these values ​​indicate how much energy it can supply and how quickly it can do so. Higher amperage and higher power... Your devices will charge faster.provided they are compatible with that speed.
Choosing the right external battery involves combining well capacity, power, ports, design and extras Depending on how you use your mobile phone and the rest of your gadgets: with that well-adjusted mix, your power bank becomes a silent ally that saves you from worrying about battery life both in your daily life and on trips and special situations.
