行動電源的結構主要包括外殼、電路和電芯。外殼材質可以分為塑料和合金兩種。塑料外殼價格相對較便宜，並具備阻燃特性；而合金外殼在耐用性和安全性方面更有優勢，適合需要經常攜帶的用戶。內部電路是行動電源的管理中樞，負責監控充放電過程。高品質的行動電源擁有過熱、過壓和過流等保護功能，確保使用安全。電芯是行動電源的核心，市場上主要使用鋰聚合物電池，其優點是容量大、重量輕、安全性高。

行動電源的容量越大，體積和重量也越大。小容量的行動電源（3000mAh以下）可以為手機充電一次，適合短途外出使用；中等容量（5000mAh至10000mAh）可以為手機充電多次，適合日常使用；大容量（10000mAh以上）則適合長時間外出或多設備使用。如果您經常外出，便攜性是一個重要的考慮因素。小型輕便的行動電源更易於攜帶，但容量可能會有所妥協。

充電速度是另一個需要考慮的因素。輸出電流越高的行動電源（如2.1A或以上），能夠大大縮短充電時間，但需要確認手機是否支持快充功能。同樣地，行動電源本身的充電速度也很重要。選購時需注意其輸入規格，高輸入（如1.5A或以上）可以縮短行動電源自身的充電時間。

行動電源通常配備microUSB、Type-C和Lightning接口。選擇多合一數據線的行動電源可以兼容多種設備，使用更方便。一些行動電源設有多個輸出接口，能同時為多個設備充電。然而，需要注意的是，同時使用時，輸出功率可能會分配，影響充電效率。

在選購行動電源時，優先選擇具備國際品質認證的產品是很重要的。這些認證包括歐盟RoHS、CE、美國FCC和蘋果MFi認證，它們表示產品符合安全和環保標準，能夠提供更可靠的使用體驗。

一個優質的行動電源應該具備多重保護功能，以確保使用的安全性。這些保護功能包括過充保護 - 防止電池過度充電、過壓保護 - 防止充電電壓過高、過放保護 - 防止電池過度放電、過載保護 - 防止電流過大、短路保護 - 防止電路短路和過熱保護 - 防止溫度過高。這些保護機制能夠在遇到異常情況時提供保護。

一些行動電源還提供附加功能，增加了便利性和使用體驗。例如，雙USB輸出允許同時為兩個設備充電，智能LED電量顯示可以清晰顯示剩餘電量，讓您隨時掌握使用狀態。另外，一些行動電源還內置了充電線，這樣您就不需要攜帶額外的充電線了，更加方便。

如果您計劃攜帶行動電源乘坐飛機，需要注意航空攜帶規定。行動電源一般不可以寄艙，而且其容量必須在160Wh以下（約20000mAh）。在選購時，請確認行動電源的標示規格，避免在安檢時被沒收。

• 最好購買較新型號尿袋，確保其充電器電池未會進入自然老化的階段。

• 盡量避免在極端天氣使用。如果會帶充電器去旅行，也記得留意氣溫情況。

• 維持持續使用，盡量避免尿袋充電器在長期充電狀態。

• 盡量避免充電器處於放電狀態，閑置狀態下建議維持尿袋電量於低電量水平。

• 如尿袋額外支援快充，建議按情況需要而使用；如長期依賴快充，同樣會加速尿袋電池老化速度。

• 如尿袋過熱、甚至突然膨脹，請立即停止使用。

• 為尿袋充電器充電的火牛，建議使用一系列原廠配用的電源供應器。

The structure of a mobile power bank mainly includes the casing, circuitry, and battery cells. The casing material can be divided into plastic and alloy. Plastic casings are relatively cheaper and have flame-retardant properties, while alloy casings have advantages in durability and safety, making them suitable for users who frequently carry them. The internal circuitry serves as the central management unit of the power bank, responsible for monitoring the charging and discharging processes. High-quality power banks have protection functions such as overheating, overvoltage, and overcurrent protection to ensure safe usage. The battery cells, usually lithium polymer batteries, are the core of the power bank, offering advantages such as large capacity, lightweight, and high safety.

The larger the capacity of a power bank, the bigger and heavier it tends to be. Power banks with small capacities (below 3000mAh) can charge a phone once and are suitable for short trips. Medium-capacity power banks (5000mAh to 10000mAh) can charge a phone multiple times and are suitable for daily use. Large-capacity power banks (above 10000mAh) are suitable for long trips or charging multiple devices. If you frequently travel, portability is an important factor to consider. Smaller and lighter power banks are easier to carry, but they may compromise on capacity.

Charging speed is another factor to consider. Power banks with higher output currents (such as 2.1A or above) can significantly shorten charging time, but it is important to ensure that your phone supports fast charging. Similarly, the charging speed of the power bank itself is also important. When purchasing, pay attention to the input specifications. Higher input currents (such as 1.5A or above) can shorten the power bank's own charging time.

Mobile power banks usually come with microUSB, Type-C, and Lightning interfaces. Choosing a power bank with a multi-function data cable allows compatibility with various devices, making it more convenient to use. Some power banks have multiple output interfaces, allowing simultaneous charging of multiple devices. However, it is important to note that when using multiple outputs simultaneously, the output power may be distributed, affecting charging efficiency.

When purchasing a power bank, it is important to prioritize products with international quality certifications. These certifications include EU RoHS, CE, US FCC, and Apple MFi certification. They indicate that the product meets safety and environmental standards and can provide a more reliable user experience.

A high-quality power bank should have multiple protection features to ensure safety during usage. These protection features include overcharging protection (preventing battery overcharging), overvoltage protection (preventing excessive charging voltage), over-discharge protection (preventing excessive battery discharge), overload protection (preventing excessive current), short circuit protection (preventing circuit short-circuiting), and overheat protection (preventing excessive temperature). These protection mechanisms can provide safety in case of abnormal situations.

Some power banks offer additional features that enhance convenience and user experience. For example, dual USB outputs allow simultaneous charging of two devices, and intelligent LED battery level display clearly shows the remaining power, allowing you to monitor usage status at any time. Additionally, some power banks have built-in charging cables, eliminating the need to carry extra charging cables, making it more convenient.

If you plan to carry a power bank on an airplane, it is important to be aware of airline carry-on regulations. Power banks are generally not allowed in checked baggage, and their capacity must be below 160Wh (approximately 20000mAh). When purchasing, please check the specifications of the power bank to avoid confiscation during security checks.

• It is best to purchase newer models of power banks to ensure that their battery chargers have not entered the stage of natural aging.

• Try to avoid using them in extreme weather conditions. If bringing a power bank while traveling, pay attention to the temperature.

• Maintain regular use and try to avoid keeping the power bank in a continuously charged state for a long time.

• Avoid leaving the power bank in a discharged state, and it is recommended to keep the battery level at a low level when idle.

• If the power bank supports fast charging, it is advisable to use it as needed. However, relying on fast charging for an extended period can accelerate the aging process of the power bank's battery.

• If the power bank overheats or suddenly expands, please stop using it immediately.

• When charging the power bank, it is recommended to use a series of original power adapters.