A mobile battery that can be used as a backup power source for smartphones, tablets, portable game consoles, and recently heated cigarettes. There are a huge variety of products on the market, some of which are available at convenience stores and kiosks. However, the range of performance and price is quite wide, and it is true that it is difficult to know what to choose. From among such a huge range of products, here are some recommended products that can be purchased at kakaku.com that suit your needs.
The point of choosing a mobile battery is capacity and output
A mobile battery with simple functions can easily be regretted if you choose it without thinking deeply about it. First of all, let’s look at the points of product selection.
I want to choose a capacity of 4,000mAh or more to support the increased capacity of smartphone batteries
The most important thing in a mobile battery is the battery capacity, which indicates how much charge can be done. It is generally expressed in mAh (milliampere hour), and the higher the value, the larger the capacity of the battery. Since there is energy loss, approximately 60 to 70% of the battery capacity is the capacity that can actually be used for charging. In other words, if the capacity is 10,000mAh, the actual usable capacity is about 6,000 to 7,000mAh, and if the capacity is 5,000mAh, about 3,000 to 3,500mAh. Also, with repeated use, the battery gradually deteriorates, and the capacity gradually decreases. In terms of weight, the difference is surprisingly large even with the same battery capacity, and even products with a capacity of 10,000mAh have a weight range of about 180g to 300g. When choosing products on Kakaku.com, it is a good idea to first narrow down the products by capacity, and then sort them in order of weight.
So, if you choose a mobile battery now, how much capacity is enough? Of course, the larger the capacity, the better, but the body will also increase accordingly. Looking at the current situation, most Android smartphones have a built-in battery of 4,000mAh or more. The iPhone series is smaller than that, and even the top model “iPhone 13 Pro Max” has a battery capacity of 4,352mAh, and the “iPhone SE (2nd generation)” has a battery capacity of 1,820mAh. If you want to fully charge the latest smartphone for one time, a mobile battery with a capacity of 4,000mAh or more will be one standard.
Check “W” for the charging speed. The number of USB PD compatible products that can perform quick charging is also increasing
On the other hand, the power “W” (watt) that indicates the output is greatly related to the charging speed. In the past, the voltage of the USB port was fixed at 5V, so charging performance could be grasped simply by looking at the magnitude of the current “A” (ampere). However, recently, the number of batteries with a higher output voltage “V” (volt) is increasing, and it is easier to understand charging performance by looking at the power “W” required by voltage x current.
“USB PD” and “QuickCharge” are the mainstream for fast charging, but the standards seem to be confused
The more battery capacity your smartphone has, the longer it will take to charge. Therefore, rapid charging, which enables charging in as short a time as possible, is attracting more and more attention. The quick charging standards for smart devices are “USB Power Delivery” (USB PD), which can be used on both iPhone and Android, and “QuickCharge” (QC), which can be used on Android devices equipped with Qualcomm’s SoC “Snapdragon” series. There are two major standards, but recently, the number of Android devices that support only USB PD is increasing. The output of USB PD is available up to 240W as the upper limit of the standard, but if you are charging a smartphone, it is sufficient if it supports 18W output.
On the other hand, an increasing number of products are equipped with their own powerful fast charging standards, mainly from Chinese manufacturers. Oppo’s Super VOOC, Huawei’s Super Charge Protocol (SCP), and Motorola’s TurboPower, to name a few. These proprietary standards basically require a manufacturer’s genuine charger, so currently only a small number of mobile batteries are compatible.
Items without the “PSE” mark are prohibited from buying and selling, even between individuals.
On February 1, 2019, the Ministry of Internal Affairs and Communications changed mobile batteries, which have caused a series of fire accidents, to be regulated under the Electrical Appliance and Material Safety Law, and prohibited the manufacture, sale, and import of products without the PSE mark. Therefore, all mobile batteries currently sold legally in Japan are “PSE compatible products”. A certain amount of safety can be expected with the PSE mark, but not all mobile batteries without the PSE mark that have been sold before are immediately dangerous. However, it is necessary to be careful because listing mobile batteries without the PSE mark on hand at flea markets and online auctions falls under the above “sales”.
Capacity 20,000mAh or more (can charge large tablets and smartphones multiple times)
Displays the remaining amount in 1% increments.
ADATA “Power Bank AP20000QCD” compatible with USB PD and QuickCharge
Mobile battery made by ADATA, which is popular on Kakaku.com due to its high cost performance. The “AP20000QCD” is the latest model, and while it has a large capacity of 20,000mAh, it has a light weight of 365g, which is about 85g lighter than the previous model “AP20000D”. In addition to the liquid crystal display that can display the remaining amount in increments of 1%, which was popular in the previous model, the charging function has also been enhanced, including two USB Type-A ports and one USB Type-C port. It also supports USB PD and QC. (Correction on April 8, 2021: This product does not support MTK PE, AFC, SCP, FCP, VOOC. We apologize for the above correction.)