Many low-frequency used small devices just run out of power when they say they do, like my Jingchen label printer or the cold wallet I use occasionally. The usage time is even less than the charging time, and if the internal battery is damaged, it might become unusable. Is there a possibility for manufacturers of these low-frequency devices to create a lightweight, battery-free version that can be plugged into a power bank when needed? This could reduce costs and increase safety during transportation. The 5V charging standard should be quite well established now, so creating such a product shouldn't be difficult. I hope manufacturers quickly recognize this demand from users and don't overlook it.