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How to Choose a Safe Power Bank: The PSE Mark and Fire Prevention
When your phone is about to die away from an outlet, a power bank feels like a lifesaver. At the same time, you may have seen news stories about power banks catching fire and felt a little uneasy about carrying one around.
Power banks are wonderfully convenient, but inside every one is a lithium-ion battery — a component that can overheat or catch fire if it is poorly made or mishandled. That is exactly why how you choose and how you use a power bank matters so much.
This guide focuses on the single most important thing to check when buying a power bank in Japan — the PSE mark — and walks you through how to choose and use one in a way that lowers the risk of fire, all explained in plain language for beginners.
The short version: three keys to a safe choice
Here are the essentials up front.
- Choose a product with the PSE mark. Since February 2019, power banks in Japan have been covered by the Electrical Appliance and Material Safety Act (the “PSE law”). Products without the round PSE mark cannot legally be manufactured, imported, or sold in Japan.
- Buy from a trusted major brand and an authorized seller. Established makers sell as registered businesses that meet the technical standards required for PSE compliance.
- Handle it properly. Avoid high heat, moisture, and drops, and use a charger and cable that are genuine or officially compatible. Good habits lower the risk further.
None of this is complicated. Just keeping these three points in mind makes a real difference to safety.
Why choosing safely matters
A smartphone today is a lifeline — messages, maps, payments, work. The power bank that keeps it running has become an everyday essential for many people.
At the same time, accidents involving products with built-in lithium-ion batteries are rising. According to Japan’s Consumer Affairs Agency and NITE (the National Institute of Technology and Evaluation), roughly 1,860 accidents involving products with lithium-ion batteries were reported over the five years from 2020 to 2024, and about 85% of them developed into fires. Because a power bank rides in your bag or pocket, close to your body, it is worth choosing one based on whether it is safe rather than whether it looks cheap.
What is the PSE mark? A beginner-friendly explanation
The PSE law and power banks
“PSE” is a mark showing that an electrical product meets the safety standards set out in Japan’s Electrical Appliance and Material Safety Act. Think of it as a sign that a product handling electricity has cleared the required safety rules.
Power banks were added to the scope of this law in February 2019. Since then, products without the PSE mark cannot be manufactured, imported, or sold in Japan. In other words, any new product on the legitimate market should carry the PSE mark as a matter of course.
Round vs. diamond-shaped marks
The PSE mark comes in two shapes. Items considered relatively higher-risk — a category called “specified electrical appliances,” which includes power banks — carry a round mark (a circle enclosing “PSE”). Products judged to be lower-risk carry a diamond-shaped mark.
For a power bank, the one you want to see is the round PSE mark. It is also reassuring to check that the name of the registered business (the maker or importer) is shown. The mark usually appears on the product body, the packaging, or the instruction manual.
How to choose and use a power bank to prevent fire
A lithium-ion battery is safe when used correctly, but mishandling it can lead to overheating or fire. No product can be called “completely safe,” but keeping the following points in mind gives you a useful guide for lowering the risk.
When choosing
- Always check for the round PSE mark and the registered business name.
- Buy from an established major brand and an authorized seller.
- Pick a capacity and output that suit your needs, and avoid products with vague or unclear specifications.
When using
- Avoid high heat. Do not leave it in a hot car in summer, in direct sunlight, or near heating appliances.
- Avoid moisture. Do not handle it with wet hands or place it near water.
- Avoid drops and impacts. Store it so it will not be knocked hard or crushed under heavy objects.
- Use a genuine or compatible charger and cable. Stick to the included accessories or trusted products designed for it.
- Stop using it if something seems wrong. If the body swells, gets unusually hot, or gives off a strange smell, stop using it.
- Check recall information now and then. Japan’s Consumer Affairs Agency recall site and NITE’s “SAFE-Lite” database let you check whether a product you own has been flagged.
How to spot products worth avoiding
If you prioritize safety, it is wise to steer clear of products like these.
- Products where the round PSE mark is missing or unclear.
- Extremely cheap, no-name products. Choosing on price alone is not recommended.
- Products with no maker name or contact details, or with unnatural-looking labels or manuals.
- Products whose stated capacity or output looks far removed from reality (for example, exaggerated numbers).
Used units from flea-market apps or private sales are hard to verify for PSE labeling and condition, and they may be degraded. If safety is your priority, buying a new product from an authorized seller is the safer bet.
Why major brands are reassuring — and two to consider
Established major brands such as Anker sell as registered businesses that meet the technical standards required for PSE compliance. Their quality-control systems, and the customer support available if anything goes wrong, are part of why they are an easy choice for beginners.
Here are two models from a major brand, in different capacities. Pick the one that fits how you use a power bank.
A first one for everyday use
Good for topping up your phone once and for a capacity that suits commuting and errands.
Anker Power Bank（10,000mAh・22.5W）
A larger capacity for travel and multiple devices
If you want to charge your phone several times, or use it heavily on trips and business travel, a model with extra capacity is handy.
Anker Zolo Power Bank（20,000mAh・45W）
A larger capacity means more charges, but the unit tends to be heavier. Picturing how often and how many devices you want to charge makes the choice easier. If you want to compare bigger models, see our guide to high-capacity power banks; if weight matters most to you, see lightweight power banks.
FAQ
Q. Where can I find the PSE mark? A. In most cases it is printed on the side or back of the power bank, or on the packaging or manual. For a power bank, look for the round PSE mark together with the registered business name. Seeing both is reassuring.
Q. Can I take a power bank on a plane? A. Handling is set according to capacity (Wh) and other factors. We cover the details in our guide to power bank airplane rules, so check it before you travel.
Q. My power bank has started to swell. Is it safe to keep using it? A. Swelling can be a sign of degradation or a fault, so it is safer to stop using it. For how to dispose of it and how long a battery typically lasts, see our guide to battery lifespan, swelling, and disposal.
Q. Is there a way to check later whether a product I own is safe? A. You can check Japan’s Consumer Affairs Agency recall site and NITE’s “SAFE-Lite” database to see whether a product is subject to a recall or accident report. When in doubt, search by product name or model number.
Summary
The first thing to check when choosing a safe power bank is the round PSE mark. Since February 2019 power banks have been covered by the PSE law, and products without the mark are not on the legitimate market. Beyond that, buying from a trusted major brand and authorized seller, and avoiding high heat, moisture, and drops while using a compatible charger and cable, all serve as guides for lowering the risk of fire.
Choose based on whether it is safe, not whether it is cheap. Keep the points in this guide in mind, and you can pick the right power bank for how you use it with confidence.
This article compares products based on public specifications and trends in customer reviews (not hands-on testing by our team). Prices, availability, and review counts change, so please check each product page for the latest. About us: About
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