Modern phones support “idle mode”, meaning that the phone can run off the charger instead of the battery (just like a laptop). It’s also called “charging bypass” or “standby mode”, because in idle mode, the battery is not used at all.
In combination with limiting the charge percentage (to 80 percent by default on the FP5) using idle mode would tremendously increase battery longevity, especially when you plugin the phone often. With durability in mind, for the Fairphone this would be something that is important to implement.
Using a tool such as ACC (Advanced Charging Controller) you can check if the phone supports idle mode. (Look at the battery current getting close to zero when plugged in and not set to charging or at 100%.)
Unfortunately, the FP5 does not seem to support idle mode according to ACC. Assuming that the hardware is capable, are there any plans to implement true idle mode on the FP5? And what about the FP1, FP2, FP3 and FP4? Do they support it?