How to store and transport batteries when not in use

[Taiwan]

My example:

I’m currently using an FP4. My method is to have a protective case custom-made for an FP4 battery, so I can carry a spare battery in my pocket for protection against drops, impacts, water, etc.

Fairphone 4 battery 100%size protector box case

A perfectly fitted Fairphone spare battery protective case [1769803880599] [1173519(1)] that’s pocket-friendly and ready to go at all times. [1173521_0] [1173522_0] It protects the battery from moisture, vibration, impact, and heat, helping prevent dampness and battery swelling. No extra tools required — when your phone runs out of power, simply swap in the battery instantly. A clean, pract ical alternative that eliminates the hassle of carrying a power bank. [1173519(1)]

I’ve traveled in Japan, South Korea, Hong Kong, Vietnam, and Singapore without any problems. (I carry 3 batteries, and the airlines fully allow them.)

And I don’t need any power bank or screwdriver at all. Since FP batteries are generally difficult to use with the connectors of commercially available chargers, I bought another second-hand FP4, removed the cameras and some unnecessary modules to reduce its weight, and use it as an external charger for the spare battery. When I going out, I can leave a depleted battery at the hotel or a rest stop and charge it at the same time using the other FP4 phone (1 battery charging externally, 1 carried in my pocket as a spare, and 1 being used in the phone), without having to spend extra time charging. I can quickly rotate and replace depleted batteries like passing a baton in a relay race, with absolutely no battery anxiety.