25w fast charging bank can not charge 40w fast charging mobile phone, because the rated power and output current of 25w fast charging bank are smaller than that of 40w mobile phone, using 25w fast charging bank to charge 40w fast charging mobile phone will cause the mobile phone charging time to be extended or not charged. Therefore, you can not use a charging bank with small power and small output current to charge a high-power and high-current mobile phone.
25w Fast charging bank can charge 40w fast charging mobile phone
< br >
The maximum output power of the 22.5w fast charging bank does not exceed the limit of 40w fast charging mobile phone, and it will not cause harm to the battery of the fast charging mobile phone during charging. Such a combination of charging, when charging, can not reach the fastest speed of 40w fast charging mobile phones, but will not cause harm to the mobile phone.
You can use it, but the charge is slow
It's okay. Because the appearance of the charging bank is for convenience, you can charge your mobile phone at any time to ensure electricity.