<p>Whether it&rsquo;s running out of battery on the go or charging devices when traveling abroad, the power bank has become one of the essential items when going out. However, with the various models featuring different power capacity and specifications in the market, ranging from power bank capacity, rated capacity or QC or PD fast-charging, it can be confusing how to choose the one you need.&nbsp; Without understanding these specifications, you may end up with a model that cannot meet your demand, or even violate flight restrictions regarding power banks. This article will guide you through capacity, charging interface and care tips of power banks, helping you to find a power bank that&rsquo;s ideal for everyday use and travels.</p>

<p>When selecting a power bank, most consumers would naturally pay attention to its capacity.&nbsp; However, many people misunderstand the meanings of labeled capacity and real capacity in &ldquo;mAh&rdquo;. The following section explains labeled capacity, real capacity and suitable application scenarios, as your reference when selecting a power bank:</p>
<h3><a name="_heading=h.mppb6j3usnnr"></a>1. Differences between labeled capacity and rated capacity of power banks</h3>
<p>The capacity of power bank is measured in &ldquo;mAh (milliampere-hour)".&nbsp; To put it simply, the greater the value, the more energy a power bank can store. However, it is important to know that the labeled total capacity is not equal to the real capacity.&nbsp; The actual output would be affected by factors like conversion efficiency and internal losses.&nbsp; Generally, the conversion efficiency is around 60%~80% and the real capacity is referred to as &ldquo;rated capacity&rdquo;.&nbsp; For example, a power bank with a labeled capacity of 10000mAh usually has a rated capacity around 6000mAh~8000mAh.</p>
<p>Currently, the capacity options commonly found in the market can be divided into 3 levels:</p>
<p>Type</p>
<table border="1" width="602" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td valign="top" width="201">
<p>Type</p>
</td>
<td valign="top" width="201">
<p>Labeled capacity</p>
</td>
<td valign="top" width="201">
<p>Actual rated capacity</p>
</td>
</tr>
<tr>
<td valign="top" width="201">
<p>Compact and portable</p>
</td>
<td valign="top" width="201">
<p>Around 5000mAh</p>
</td>
<td valign="top" width="201">
<p>Around 4000mAh</p>
</td>
</tr>
<tr>
<td valign="top" width="201">
<p>Medium to high capacity</p>
</td>
<td valign="top" width="201">
<p>Around 10000mAh</p>
</td>
<td valign="top" width="201">
<p>Around 8000mAh</p>
</td>
</tr>
<tr>
<td valign="top" width="201">
<p>Ultra-high capacity</p>
</td>
<td valign="top" width="201">
<p>Around 20000mAh or more</p>
</td>
<td valign="top" width="201">
<p>Around 12000mAh</p>
</td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<h3><a name="_heading=h.obkn5cbedjl7"></a>2. Suitable scenarios for different power bank capacities</h3>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Compact and portable type: For short distance &amp; emergency use (5000mAh)<br>Perfect for commuting or short outings.&nbsp; These compact and lightweight power banks can charge a smartphone once or twice.&nbsp; This type is especially ideal for users who do not want to add extra weight to their bag.<br><br></p>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Medium to high capacity: For daily outings (10000mAh)<br>A perfect balance between convenience and battery life.&nbsp; It can provide 2 or more full charges to smartphones and is reasonably portable.&nbsp; For most users, this type is the most practical choice.<br><br></p>
<p class="MsoNormal" style="text-indent: -18.0pt; mso-list: l0 level1 lfo1; margin: 0cm 0cm 12.0pt 36.0pt;">●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ultra-high capacity: For long-trips, business, gaming or multi-device use (20000mAh or more):<br>If you need extended power for business, camping, traveling, charging multiple devices (like smartphones, tablets and earbuds) simultaneously, a power bank with capacity of 20000mAh or more will be a suitable choice.&nbsp; Some models support dual or triple outputs, fast-charging protocols and laptop power delivery, making them the best choice of high-demand users.</p>

How to choose the capacity and rated capacity of a power bank? What is rated capacity?

<p>Besides the capacity, the charging speed and compatibility of a power bank are also affected by &ldquo;charging port type&rdquo; and &ldquo;output wattage&rdquo;.&nbsp; If you only check mAh capacity and ignore the output specifications, you may experience slow charging, no fast-charging support, or even failure to charge the device.</p>
<h3><a name="_heading=h.jac5s7at92gs"></a>1. Common charging port types</h3>
<p>Most power banks nowadays come with 2 to 3 or more types of ports.&nbsp; The most common ports include:</p>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; USB-A: Traditional standard port.&nbsp; Currently, USB-A is less used by smartphones and more suitable for devices like tablets or certain Bluetooth earbuds.&nbsp; The disadvantage is USB 2.0 only supports one-way output and does not provide PD fast-charging. The transfer rate varies by the manufacturer&rsquo;s USB specification.<br></p>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; USB-C: In recent years, most new devices (such as iPhone 15 series, MacBook and Samsung smartphones) have introduced USB-C. This type of port supports fully-duplex as well as PD fast-charging, making it the first choice most consumers consider.<br></p>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Lightning: The port exclusive to Apple devices, including iPhone, AirPods and some iPad models.&nbsp; A few power banks offer Lightning ports for Apple users; however, it is gradually being replaced by USB-C.</p>
<h3><a name="_heading=h.atbtg139vbub"></a>2. Different output power for different devices</h3>
<p>The &ldquo;output power&rdquo; of a power bank is usually marked in W, meaning how quickly it can deliver the power. Formula of calculating watts = V (rated voltage) x A (rated current).&nbsp; Common output power options of power banks include 5V/1A and 5V/2A, equal to 5W~10<span lang="ZH-TW">Ｗ</span>.&nbsp; For models supporting &ldquo;fast-charging&rdquo;, basically the output power is 18W or higher.&nbsp; When choosing a power bank, it is recommended to match the wattage output with the device's power requirement.</p>
<table border="1" width="429" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td valign="top" width="125">
<p align="center">Power range</p>
</td>
<td valign="top" width="303">
<p align="center">Suitable device types</p>
</td>
</tr>
<tr>
<td valign="top" width="125">
<p>5W~10W</p>
</td>
<td valign="top" width="303">
<p>Bluetooth earbuds, smart watches, small wearables</p>
</td>
</tr>
<tr>
<td valign="top" width="125">
<p>18W</p>
</td>
<td valign="top" width="303">
<p>General smartphones (including Android and iPhone)</p>
</td>
</tr>
<tr>
<td valign="top" width="125">
<p>20W~30W or higher</p>
</td>
<td valign="top" width="303">
<p>Tablets, Switch, fast-charging phones, etc.</p>
</td>
</tr>
<tr>
<td valign="top" width="125">
<p>45W or higher</p>
</td>
<td valign="top" width="303">
<p>Devices like laptops, iPad Pro, etc.</p>
</td>
</tr>
</tbody>
</table>
<p>For most smartphones, fast-charging requires 18W~30W.&nbsp; If you need to charge high-consumption devices such as laptops or tablets, it is recommended to use a power bank supporting PD (Power Delivery) protocol and providing at least 30W output to enjoy true &ldquo;fast-charging&rdquo;.</p>
<h3><a name="_heading=h.y9yevr1hk8p5"></a>3. Differences between QC and PD</h3>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; QC (QuickCharge): QC is Qualcomm&rsquo;s fast-charging technology for most Android smartphones and Samsung S8, S9, Note 8 series.&nbsp; QC allows compatible devices to charge up to 80% in 35 minutes and supports a maximum power of 27W, dual-channel charging, smart heat dissipation and quick startup.&nbsp; However, this technology is not compatible to high-power devices such as laptops.<br></p>
<p>PD (PowerDelivery):One of USB-C standard specifications released by <a href="https://en.wikipedia.org/wiki/USB_Implementers_Forum" target="_blank" rel="noopener">USB-IF</a>.5 power options, including 10W, 18W, 36W, 60W and 100W, making PD standard compatible to various devices such as smartphones, tablets, game consoles and laptops.&nbsp; This technology is exclusive to USB&ndash;C ports but also compatible to QC-supported devices, offering higher compatibility.<br><br></p>

Fail to fast charge or compatibility issues? Things to know before choosing a power bank

<p>Whether taking a domestic or international flight, the power bank has become an essential travel accessory for many people.&nbsp; However, some travelers may not be aware of that airlines enforce strict restrictions on &ldquo;the capacity and carrying method of power banks&rdquo;.&nbsp; Exceeding the limits may not only result in being stopped by security, but also a high risk of confiscation. Here are some useful precautions when carrying a power bank on board.</p>
<h3><a name="_heading=h.stoqokrq4ace"></a>1. Capacity restriction: No application required for power banks under 100Wh</h3>
<p>According to ICAO and Taiwan Civil Aviation Administration regulations, when traveling by planes, no prior application is required when the capacity of each power bank carried onboard is 100Wh (watt-hour) or under; for power banks between 100Wh and 160Wh, the passenger should acquire prior airline approval.&nbsp; No power bank exceeding 160Wh is allowed to be brought onto the aircraft.&nbsp;&nbsp;</p>
<p>You can use the formula below to convert mAh to Wh:</p>
<p>Wh = (mAh &times; V) &divide; 1000, where V (labeled voltage) is usually marked on the device.</p>
<p>For example, for a power bank labeled 27000mAh with a voltage of 3.7, the result is 99.9Wh, just within the maximum allowance for power banks.</p>
<h3><a name="_heading=h.a6kqms1xi9y3"></a>2. Carrying restrictions: Carry-on only.&nbsp; Not allowed in check-in luggage</h3>
<p>Power banks are classified as &ldquo;spare lithium batteries&rdquo;; according to regulations, they can only be packed in carry-on and are not allowed in check-in luggage. There is also a restriction on the number of qualified power banks each passenger may carry onboard.&nbsp; For example, EVA AIR allows each passenger to bring up to &ldquo;15 electronic devices&rdquo; and/or &ldquo;20 spare batteries (including power banks&rdquo;, with a watt-hour rating 100Wh or less.&nbsp; Prior airline approval is required when a passenger carries more than 15PED and/or 20 spare batteries. It is also recommended to inform the security and present the power bank with largest capacity before baggage screening to avoid being stopped by X-ray scan. You may not carry a power bank onboard if it&rsquo;s swelling, damaged or does not have a clear capacity label.&nbsp; Make sure to check carefully before traveling.<br><br></p>
<h3><a name="_heading=h.2zvr6ctrbsns"></a>3. International travel regulations: Vary by countries and airlines</h3>
<p>Although most airlines follow <a href="https://en.wikipedia.org/wiki/International_Civil_Aviation_Organization" target="_blank" rel="noopener">ICAO</a> regulations, specific rules may vary by countries and airlines. For example, in Taiwan, passengers are generally prohibited from using power banks or charging from power banks during the flight.&nbsp; Power banks are not allowed to be placed in the overhead compartment, either.&nbsp; Some airlines set stricter restrictions, such as banning power banks with wall plugs or requiring them to be kept in a separate sealed bag. Therefore, when taking connecting flights or traveling across different countries, it is recommended to check the airline&rsquo;s official website for latest flight restrictions to avoid confiscation or boarding delay due to different regulations.</p>

Flight restrictions on power banks and precautions

<p>Choosing a power bank isn&rsquo;t just about comparing the capacity or price. Picking the wrong one, you may not only experience slow charging, but also face a faulty device without after-sales service. Here, we list up 3 key buying tips to help you avoid unreliable no-name brands and choose a power bank that is stable and safe to use.</p>
<h3><a name="_heading=h.qe5gw14evesw"></a>1. Time cost and charging efficiency</h3>
<p>When purchasing a power bank, most people may only focus on the price; however, what really matters is the &ldquo;cost performance&rdquo;, taking elements like the capacity, power, fast-charging technology and real-world application into account. For example, current market price of a basic 10000mAh power bank starts from NT$300 and advanced high-end models with 20000mAh or more, supporting PD fast-charging and laptop charging, generally cost NT$600~2000.&nbsp; But when charging efficiency and cost effectiveness are factored in, PD/QC fast-charging is 2x or more faster than standard charging.&nbsp; You can spend the saved time on work or travel, making such models a more cost-effective choice in the long run.</p>
<h3><a name="_heading=h.xygvz9ldwcjc"></a>2. Safety and brand reputation</h3>
<p>We all hear incidents that power banks catching fire happen sometimes.&nbsp; When choosing a power bank, besides the price, consumers should also consider &ldquo;lifespan&rdquo; and &ldquo;safety&rdquo;.&nbsp; It is recommended to pick models with BSMI approval or designed with NTC and PTC thermistors to further ensure your safety.&nbsp; Brand-name models support PD/QC fast-charging, USB-C fast-charging, smart output control and multi-circuit protection.</p>
<p>Additionally, the brand&rsquo;s &ldquo;reliability&rdquo; is also critical.&nbsp; Compared to cheap no-name brands, reputable brands have a higher yield, more trustworthy warranty service and higher reliability.&nbsp; Their products offer more stable performance and longer lifespan. All ADATA power banks are approved by BSMI and equipped with multi-circuit protection mechanisms, including overcharge, over-discharge, over-temperature and short-circuit protection.&nbsp; Whether for daily commutes or overseas trips, choosing a reliable brand can ensure your safety and long-lasting use.</p>
<h3><a name="_heading=h.kp9v41p11ajl"></a>3. After-sales service and warranty</h3>
<p>Power banks are high-density batteries that are carried around for a long period of time.&nbsp; Issues like swelling, unable to charge or failure can make power banks become &ldquo;electronic consumables&rdquo; easily.&nbsp; It is recommended to choose a brand with a product warranty. All ADATA power banks provide a 1-year free warranty repair and online customer support, helping consumers to solve problems immediately.&nbsp; Compared to unbranded products or those without warranty, reputable brands offer more reliable after-sales service, ensuring worry-free use.</p>

How to choose a power bank? Cost performance, safety, and after-sales warranty

<p>Even the highest-spec power bank can face shortened lifespan, performance degradation or even safety concerns when it is not used or stored properly.&nbsp; Following the correct charging habits and storage method is the key to extend your power bank&rsquo;s lifespan.&nbsp;&nbsp;&nbsp; Here are 3 power bank maintenance tips:</p>
<h3><a name="_heading=h.s04td1ueecse"></a>1. Develop correct charging habits</h3>
<p>Lithium batteries should never be kept &ldquo;completely discharged&rdquo; or &ldquo;fully charged for a long time&rdquo;.&nbsp; It is recommended to recharge your power bank when the battery level drops to 20~30%.&nbsp; For charging, avoid leaving the power bank plugged for a long time, using it while charging or charging overnight.&nbsp; Fully charged or discharged for a long time can lead to abnormal chemical reaction inside the battery, shortening its lifespan or even increasing the risk of swelling.</p>
<h3><a name="_heading=h.7newwqvs7mjd"></a>2. Maintain proper storage conditions</h3>
<p>Power banks are lithium batteries; improper storage conditions may accelerate battery aging or even cause safety concerns. The ideal storage conditions are dry, free of direct sunlight, well-ventilated and a temperature between 15&deg;C~25&deg;C.&nbsp; Do not leave power banks in areas with high-temperature (like in cars), moisture (like bathroom) or direct sunlight.</p>
<p>Meanwhile, if you won&rsquo;t use the power bank for an extended period of time, it is recommended to maintain the battery level at around 50%, avoiding fully discharged or charged.&nbsp; Recharge the power bank every 2~3 months to maintain battery activity. Leaving the power bank unused for too long can lead to deep discharge, making it difficult to activate or impossible to recharge again.</p>
<h3><a name="_heading=h.e3r2iot3bjbl"></a>3. Regular cleaning and inspection</h3>
<p>Power banks are high-density electronic products that require no complicated maintenance, but regular cleaning can effectively extend its lifespan and increase the safety. Below are some practical tips:</p>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Enclosure cleaning: Wipe with a soft dry cloth or microfiber cloth.&nbsp; Use alcohol wipes to remove oil stains. Do not strong acidic cleaners or excessive liquid to prevent short circuits caused by liquid seepage.<br></p>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Port care: When exposed in the air for a long time, dust can accumulate in USB-A, USB-C and Lightning ports or oxidization can occur.&nbsp; Gently clean with a cotton swab or a blower.<br></p>
<p>●&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regular exterior inspection: Stop using the power bank immediately if you notice any swelling, smell, damages or heating.&nbsp; Send the product to an authorized return channel or the brand&rsquo;s after-sales center for inspection.&nbsp; Do not try to dismantle the power bank by yourself.</p>

Important tips on power bank maintenance｜Charging, storing, and cleaning

<p>Whether you are a tech enthusiast pursuing ultimate performance or simply looking for a lightweight power bank for daily commutes, &ldquo;brand&rdquo; reliability is always a crucial factor when choosing a power bank. ADATA power bank family provides multi-circuit protection mechanisms; the safety mechanism activates instantly when overheating or short circuit are detected, allowing you to carry around and use with confidence.&nbsp; Additionally, ADATA power bank family offers a wide range of capacity options magnetic wireless fast-charging and multi-port simultaneous charging and discharging designs to meet the need to various scenarios, from everyday use to outdoor adventure.&nbsp; Visit <a href="https://www.adata.com/en/consumer/category/power-banks/" target="_blank" rel="noopener">ADATA's official website </a>now and choose the power bank that suits your lifestyle!</p>
<p>Further reading:</p>
<p><a href="https://www.adata.com/en/quikTips/fast-charging-and-protection-mechanism-for-power-banks/" target="_blank" rel="noopener">Fast-charging and protection mechanism for power banks</a><br><a href="https://www.adata.com/en/quikTips/type-c-charging-accessory-selection/" target="_blank" rel="noopener">Type-C charging accessory selection guide: 4 key tips</a></p>

Power bank recommendation｜ADATA high-quality power banks, maximize the potential of your battery

How to choose a power bank? A complete guide from capacity differences, fast-charging specifications to flight restrictions to help you choose the perfect power bank for travel and everyday use.

How to choose a power bank? Power bank capacity, rated capacity and flight restrictions on power banks