Choosing the correct USB adaptor is very important for your safety and the
function of the battery pack.
Charging by cable: As a minimum you need to use an USB adapter with the
following output: 5V / 2A.
Wireless charging: You will need a 10W wireless charger and an adapter that
fits it.
The battery pack on 10,400 mAh will fully charge in 10 hours, while 7 hours
is enough the first time. Never charge the battery in or near water!
Operating temperature: -20°C to 60°C
Charging temperature: 10°C to 45°C