one
The charger doesn't work in cold weather. This may be because the power bank has entered the charge protection state.
two
When the mobile power supply is overcharged or the charging voltage is too high, the mobile power supply will enter the charging protection state, which is not charged at this time, and the mobile power supply can be plugged into the USB output of the computer for 2 hours to charge the charging protection state.
It's broken. The temperature is low. The discharge will be faster. The capacity decreases. But it won't fail to charge.