Hello!
I found this article on the official Fairphone forums:
https://support.fairphone.com/hc...9V 3A is recommended by Fairphone, the standard is Fastcharge 4.0 from Qualcomm, and that goes from 5V to 20V...
In the forum post, some users report that it charges VERY slowly (6+ days) when switched off with a 1A (probably 5V) charger.
It's a big battery, and it certainly needs a minimum of amps to charge it... I had to research the physics behind this, but a 5Volt 1Amp charger is probably not enough.
What about the PC/laptop? Many modern devices have 5V 2A ports for charging other devices...
