How do you charge your other L5 battery

[Quarnero]

@Lliure, while based on: “There is virtually no self-discharge below about 4.0V at 20°C (68°F); storing at 3.7V yields amazing longevity for most Li-ion systems. Finding the exact 40–50 percent SoC level to store Li-ion is not that important.” I’d therefore/definitively agree/support with this thread belonging general and/or starting point recommendation:

@carlosgonz

The Librem 5 is not designed to constantly change or manipulate the battery.

P.S. Overnight I usually leave my Librem 5 connected (when already fully charged from reliable power supply) to the one of mine very reliable USB-DCP protocol based power supplies.

P.P.S. And by the way, best/reliable external charger for Librem 5 battery is definitively Librem 5 by itself. On this regard, please rethink again below two very useful recommendations/advises:

@dos

FWIW, charging extra batteries can be easily done via the phone itself. If you use a powerful enough power supply with high enough input current limit, you should be able to take the battery off while keeping the phone fully operational, powered from USB. Then you can just put the other battery in and it should simply start to charge.

@dos

Ah, it just came into my mind that I’m not entirely sure whether the gauge will get correctly reconfigured by the kernel after a battery hot-swap (you may need to reload the kernel module for it to happen).

Edit: As related to gauge readings it might be important to re-charge second Librem 5 battery, from reliable power supply, when related Linux phone powered-off by waiting until red LED light off (even if red LED light was already off when some particular phone on). Afterwards, by keeping your phone to power supply, turn it on again and if no red LED light appear again your Librem 5 battery is configured properly (to 100% of its capacity or rather to exactly 4.20V).