A complete guide to choosing a mobile phone power bank

I. Introduction

In today’s digital age, mobile phones have become an indispensable part of people’s lives. Whether it is work, study or entertainment, mobile phones are indispensable. However, the battery life of mobile phones has always been a troubling problem, especially when going out, insufficient power of mobile phones often brings many inconveniences. At this time, power banks have become the key accessories to solve this problem. However, faced with a wide range of power bank products on the market, consumers often feel at a loss as to how to choose a power bank that suits them. This article will introduce the key points of purchasing mobile phone power banks in detail from multiple aspects to help everyone make wise purchasing decisions.

II. Clarify your own needs

(I) Daily use scenarios

1. Daily commuting If it is only used for daily commuting to and from get off work, and for emergency charging of mobile phones, headphones and other devices, then the capacity requirements for power banks are relatively low. Generally speaking, a power bank of 5000-10000mAh can meet the needs. Power banks of this capacity are small in size and easy to carry. They can be easily put in pockets or bags without bringing too much burden to travel.
2. Long-distance travel If you need to travel long distances, such as on business trips, travel, etc., and have multiple devices that need to be charged, then you need to choose a power bank with a larger capacity. A power bank with a capacity of 10000-20000mAh is a more suitable choice. It can provide multiple charges for mobile phones, ensuring that the devices always have sufficient power during the trip.
3. Outdoor sports For people who like outdoor sports such as mountain climbing, camping, and exploration, the choice of power banks needs to be more cautious. In addition to considering the capacity, you also need to pay attention to the power bank’s waterproof and dustproof performance, low-temperature working ability, and whether it supports solar charging. Power banks with IP67 waterproof and dustproof rating can be used normally in harsh outdoor environments, while power banks with low-temperature black technology can continuously power devices in cold conditions. Solar power banks can replenish power outdoors through solar panels, which is both environmentally friendly and practical.

(II) Charging device types

1. Charging a single device If you only need to charge your mobile phone, you can choose a power bank based on the phone’s interface type and charging needs. For example, Apple phone users can choose power banks that support Lightning interface or wireless charging; Android phone users can choose power banks that support Type-C interface.
2. Charging multiple devices If you need to charge multiple devices at the same time, such as mobile phones, tablets, Bluetooth headsets, etc., you need to choose a power bank with multiple interfaces. Generally speaking, power banks with multiple interfaces such as USB-A, USB-C, Type-C, etc. can meet the charging needs of different devices.

III. Pay attention to the core parameters of power banks

(I) Battery capacity

1. Nominal capacity and rated capacity When purchasing power banks, we often see the battery capacity marked on the product, such as 10000mAh, 20000mAh, etc. However, it should be noted that this does not represent the actual amount of power that the power bank can charge for the device. The actual amount of power that can be charged is usually expressed in rated capacity, which is affected by many factors, such as the conversion efficiency of the power bank, the battery voltage of the device, etc. Generally speaking, the rated capacity will be lower than the nominal capacity. For example, a power bank with a nominal capacity of 20,000mAh may only have a rated capacity of about 12,000mAh.
2. Impact of ambient temperature on capacity Ambient temperature will also affect the actual output capacity of the power bank. At an ambient temperature of 25°C, the actual output efficiency of the power bank may reach 100%; at 10°C, this efficiency drops to 85%; if it is below 0°C, the efficiency may be less than 60%. Therefore, when using a power bank in a cold environment, the charging speed may slow down and the number of charging times may decrease.

(II) Charging power and fast charging protocol

1. Bidirectional fast charging Charging power is an important factor affecting charging speed. In addition to paying attention to the power of the power bank to charge the device, you should also pay attention to the charging power of the power bank itself, that is, whether it supports bidirectional fast charging. Power banks that support bidirectional fast charging can greatly shorten their own charging time. For example, if a 20000mAh power bank only supports normal charging, it takes about 21.5 hours to fully charge with a 5W charging head; if it supports two-way fast charging, it only takes 6.9 hours with a 33W fast charging head.
2. Fast charging protocol compatibility Different mobile phone brands have different fast charging protocols. Therefore, when purchasing a power bank, make sure it supports the fast charging protocol used by your phone. All Apple models since iPhone 8 support the PD fast charging protocol, but must be output through the C port. The situation of Android phones is more complicated, and different brands have different fast charging protocols. For example, Huawei and Honor users should choose power banks that support SCP/FCP protocols, especially those who pursue 40W + super fast charging, and some also need special encryption chips; Xiaomi and OV users should focus on QC3.0/4.0 protocols; OnePlus and Realme users need VOOC/Dart protocols. In order to avoid pitfalls, it is recommended to choose a power bank that is compatible with multiple protocols. Brands such as Anker and Baseus do a good job.

(III) Battery Type

1. Lithium polymer battery Lithium polymer battery has the advantages of being thin, safe, and plastic. It has a high energy density, can provide stable power output for the device, and is not prone to problems such as bulging and leakage. Therefore, when purchasing a power bank, give priority to products using lithium polymer batteries.
2. Lithium ion battery Lithium ion battery has a relatively low cost and large capacity, but is slightly insufficient in terms of safety and stability. It has a large shape, low density, poor portability, and is less safe than lithium polymer batteries. It may not be able to output power stably, which in turn affects the charging experience of the device.

IV. Pay attention to the safety of power banks

(I) Safety certification

1. 3C certification 3C certification is China’s compulsory product certification system. It is an important basis for judging whether a power bank meets national standards. Power banks that have not passed the 3C certification may not follow strict safety standards and specifications during the production process. There may be defects in the quality of the battery cells and circuit design, which may easily lead to safety problems such as overheating, short circuit, and explosion, which seriously threaten the personal and property safety of users. Therefore, when purchasing a power bank, be sure to carefully check whether the product has the 3C certification mark.
2. Other certifications In addition to 3C certification, some international certifications such as UL certification and CE certification are also important guarantees for the quality and safety of power banks. These certification marks represent that the power bank has undergone strict quality testing and safety assessments. Consumers can give priority to products with these certifications when purchasing.

(II) Safety protection mechanism

1. Overcharge protection The overcharge protection function can prevent the power bank from damaging the device battery due to overcharging when charging the device. When the device battery is fully charged, the power bank will automatically stop charging to avoid problems such as bulging and leakage of the battery due to long-term overcharging, thereby extending the battery life.
2. Overcurrent protection The overcurrent protection function can prevent the power bank from damaging the device and the power bank itself due to excessive current during charging. When the charging current exceeds the safe range, the power bank will automatically cut off the circuit to protect the safety of the device and the power bank.
3. Short circuit protection The short circuit protection function can quickly cut off the power supply when a short circuit occurs in the power bank to avoid safety accidents such as fire and explosion caused by short circuit.
4. Overheat protection The power bank will generate a certain amount of heat during charging. If the heat dissipation is poor, it may cause the temperature to be too high. The overheat protection function can monitor the temperature of the power bank in real time. When the temperature exceeds the safe range, it will automatically reduce the charging power or stop charging to prevent safety problems caused by overheating.

V. Consider portability and appearance design

(I) Size and weight

1. Daily carry If the power bank is mainly used for daily carry, such as putting it in a pocket or bag, then the size and weight are very important. Generally speaking, a small and light power bank is more convenient to carry. For example, some 5000-10000mAh power banks are of moderate size and weight, and will not bring too much burden to travel.
2. Special scenarios For some special scenarios, such as outdoor sports and travel, although portability also needs to be considered, it may be more important to pay attention to the capacity and function of the power bank. In this case, you can choose some power banks with larger capacity but reasonable design, such as power banks with accessories such as lanyards and storage bags, which are convenient to carry and use.

(II) Appearance design

1. Color and style The appearance design of the power bank is also one of the factors that consumers pay attention to. Power banks of different brands and models have their own characteristics in color and style, and consumers can choose according to their preferences. For example, some power banks adopt a simple and fashionable design style, with bright colors and exquisite appearance; while other power banks focus on functionality and are more practical in design.
2. Material and texture The material and texture of the power bank will also affect the user experience. High-quality materials can make the power bank more durable and improve the feel. For example, some power banks use metal shells, which are very textured and have good heat dissipation performance; while other power banks use plastic shells, which are lighter and have lower costs.