【2026 Power Bank Buying Guide】 How to Buy the best Power Bank | Key Considerations| Recommendations 2026-01-14 In the past, when we went out, we worried about our phone's battery life and always carried a portable power bank (commonly known as a "power bank") for emergencies. However, as many smartphone brands now support wireless charging, portable power banks have become increasingly popular. This article will briefly introduce the principles of portable power banks, their types, and how to choose the right portable power bank for yourself. 【Read More】【Information Before Boarding 2026】Understanding CCC Certification for Power Banks | Latest Regulations at Chinese Airports | Tips for Buying Power Banks | Recommended Products 1)Two Types of Wireless Charging Resonant Charging Inductive Charging 2) Considerations When Choosing a Portable Power Bank International Standard Qi Output Power Number of Coils Safety Features Size 3) Frequently Asked Questions What are the advantages and disadvantages of wireless charging compared to wired charging? Is wireless charging safe? 4) Portable Power Bank Recommendations 1. Two Types of Wireless Charging 1.1 Resonant Charging Resonant wireless charging converts electrical energy into magnetic energy within the transmitter coil, which then enters the receiver coil, converting the magnetic energy back into electrical energy for charging. Therefore, as long as the smart device and charger are within a designated distance, charging can occur without contact. This type of charging reduces limitations on the position of the receiver; as long as the receiver is within the coverage of the resonant wireless charger, power transfer can be established. 1.2 Inductive Charging Inductive charging uses the principle of electromagnetic induction. When the wireless charger detects the presence of a compatible charging device's coil in its range, the electrons (i.e., electricity) within the transmitter coil will start to flow, generating a magnetic field. The receiving coil also senses this magnetic field, causing electrons to circulate and generating the current that charges the smart device's battery. Currently, due to business strategies, cost considerations, and technical factors, inductive charging is the mainstream approach. This is what most people encounter daily, requiring the device to contact or align with the power bank, wherein the internal charging coils must be aligned. 2. Considerations When Choosing a Portable Power Bank 2.1 International Standard Qi Qi is a standard for short-range low-power wireless inductive power transmission set by the Wireless Power Consortium. It is supported by over 200 companies, including Apple, Samsung, HTC, and Logitech. With this standard, all electronic devices produced by various companies can be compatible with wireless charging devices. Therefore, when choosing a portable power bank, look for products carrying the Qi certification label to easily and safely enjoy the convenience of wireless charging. 2.2 Output Power The output wattage (W) of a portable power bank affects charging speed, with common specifications of 5W, 7.5W, and 10W. However, if the input power of the smart device is insufficient, the high output wattage of the charger won't be fully utilized. For instance, iPhones support 7.5W charging power, while 10W is applicable for brands like Samsung. Therefore, ensure to check both specifications when purchasing. 2.3 Number of Coils Since the principle of wireless charging is based on electromagnetic induction, the device is constructed using two coils forming a closed circuit. The number of coils within the device will impact the charging method. Most wireless chargers on the market come in single or triple coil configurations. Single coil products are lighter and smaller, making them more portable. The benefit is that they can minimize the charger's size, and are generally cheaper. However, their drawback is that they must be precisely aligned with the coil to charge; if misplaced, charging may not occur or may slow down. Multiple coils expand the range of wireless charging, no longer limited to specific locations. However, these chargers generally have a larger size and higher price due to accommodating multiple coils. Whichever type you choose, ensure to pay attention to the placement of the Qi wireless charging chip in your phone for smoother wireless charging. 2.4 Safety Features Wireless charging utilizes electromagnetic induction, which can generate heat during charging. To make wireless charging safer, most wireless chargers come with built-in safety mechanisms that cut off power once temperatures reach a certain threshold, ensuring both the device and user remain unharmed. Therefore, when purchasing, check the charger’s heat dissipation performance and safety features. Some chargers even come with foreign object detection, over-voltage protection, and over-current protection functions. For example, if metal items like keys or coins are placed on them, the foreign object detector will stop charging and provide light or sound alerts. 2.5 Size For a portable power bank, battery capacity and portability often come into conflict. The larger the capacity, the bigger the battery, increasing the overall size of the power bank. Additionally, the number of coils in a wireless charger also affects its size. Single coils are smaller, while multiple coils are generally larger. Therefore, before purchasing, consider whether you need a larger capacity or a more portable power bank. 3. Frequently Asked Questions 3.1 What are the advantages and disadvantages of wireless charging compared to wired charging? The biggest advantage of wireless charging compared to wired charging is the reduced wear from plugging and unplugging and the convenience it offers. However, currently, wireless charging devices support a maximum output power of 15W, while wired charging can exceed 100W. While high-wattage products charge faster, they still don’t match the speed of direct charging with a cable. 3.2 Is wireless charging safe? Wireless charging activates only under specific conditions. During charging, it targets the receiving coils in smart devices like phones and watches through sensing, and the magnetic field range is quite small—charging will stop if the distance is slightly off. The micro-radiation emitted during charging is lower than that of a mobile phone accessing wireless networks. Furthermore, certified wireless chargers usually come with multiple protection mechanisms, so as long as you buy certified products, there’s little to worry about. 4. Portable Power Bank Recommendations Belkin BoostCharge Pro Qi2 15W 5000mAh Magnetic Wireless Charging Power Bank Provides fast charging up to 15W for compatible iPhones and other Qi2 devices using Qi2 technology with magnetic alignment. It extends battery life by 16 hours and includes a stand to keep your device upright while in use. Comes with a USB-C cable to charge multiple devices. MOMAX iPower PD 10000mAh Fast Charging Power Bank (Black) #iP77D (CCC) Safe and reliable fast charging, supporting PD20W and QC3.0 fast charging protocols for rapid power restoration. Features dual input ports, supporting MicroUSB or USB-C fast charging.Compatible with most electronic devices, addressing the charging needs of mobile phones and tablets. Rated energy of 37Wh, compliant with civil aviation regulations and allowed on board. Verbatim QC3.0+PD 18W 10000mAh Mobile Rechargeable Battery w/MFI & TypeC Cable Black #66972 The Verbatim 10000mAh PD & QC 3.0 power bank can charge up to two devices simultaneously. Combining PD 3.0 and Qualcomm® Quick Charge™ 3.0 technologies, it provides fast charging for your devices. The USB-A QC 3.0 port supports up to 18W fast charging. The Type-C port can be used for both power input and output, supporting up to 18W PD charging. The maximum total output is 18W. Belkin PD 20W 10000mAh Power Bank w/Type-C Cable White #BPB021fqWH (CCC) 10KmAh capacity, fast charging. 20W output lets you quickly charge your smartphones and tablets. Charge two devices simultaneously, with LED indicators keeping you informed about battery life.Belkin Smart Protection: Our safety features include fire-retardant materials, and each product is tested to protect against overcurrent, overtemperature, overvoltage, short circuits, and overloads. PhotoFast SSB mini Qi2 PD 20W 10000mAh Solid State Wireless Power Bank (Black) Features a solid-state explosion-proof formula, ensuring safety against drops and high temperatures. With a capacity of 10000mAh, it is compact and lightweight. Capable of charging 5 devices simultaneously with built-in Type-C and Lightning cables for convenience. Life span is twice that of traditional lithium batteries, compatible with Qi2 wireless charging system—just place it on and start charging.
