Hi! This is Sensei.
“I was watching TikTok during my break at work, and my battery died…”
“I was making a video call back home at night, and my phone turned off…”
In times like these, are you running to a nearby Seven-Eleven or Lawson to buy a white charger?
That is like throwing your money into a ditch!
Batteries at convenience stores (Konbini / コンビニ) are “expensive and have low capacity.”
Today, I (Sensei) will tell you about the best portable batteries that can “charge your iPhone more than 4 times” for the same price.
Also, Japan has many “Earthquakes (Jishin / 地震)”.
When there is a power outage (Teiden / 停電), it is truly dangerous if you cannot use your smartphone. To protect your own life, you should own at least one.
Which is better: Convenience Stores or Online?
The difference is clear if you look at the numbers.
We need to look at the number called “mAh (milliampere-hour).”
| Place (Basho / 場所) | Price (Nedan / 値段) | Capacity (Yoryo / 容量) | Charges |
|---|---|---|---|
| Convenience Store (Konbini / コンビニ) |
Approx. 3,500 yen | 5,000mAh | About 1 time |
| Amazon / Rakuten (Online / ネット) |
Approx. 3,500 yen (Same!) |
10,000〜 20,000mAh |
3〜5 times! |
Buying at a convenience store is only for “emergencies.”
For everyday use, make sure to buy online.
2 Recommended Batteries for Trainees
If you buy a cheap one from a strange manufacturer, there is a risk of fire (Hakka / 発火).
You can’t go wrong if you choose the brand “Anker (アンカー)”, which is the most famous and safe in the world.
① For carrying every day (10000mAh)
It’s not heavy even if you put it in your work bag.
It can charge an iPhone about 2 to 3 times, so you can feel safe even if you go out all day.
② For Earthquakes & Video Calls (20000mAh) 🔥Recommended
It’s a bit heavy, but it can charge an iPhone more than 4 times.
Even if the power is out for 3 days due to a typhoon or earthquake, you can stay in touch with your family with this.
It’s also convenient when the power outlet (Konsento / コンセント) is far from your bed in the dormitory (Ryo / 寮).
Summary: Preparedness is key
In Japan, there is a saying: “Sonae areba urei nashi (備えあれば憂いなし).”
It means if you are prepared, you don’t have to worry.
You can buy peace of mind for just 3,000 to 5,000 yen.
When you get your next salary (Kyuryo / 給料), buy this first.
Once you buy a battery, get unlimited data for your phone too! 👇
📱 See SIM cards with unlimited data
