55 watt charger can not charge 4o watt mobile phone, this is because the charging power of 55 watt charger is between 50 and 52w, and the actual charging power of 40 watt mobile phone is only 45 watts, the charging power of 55 watt charger is greater than the charging power of 4o watt mobile phone, if 55 watt charger to 40w mobile phone charging, Although it will make the 40w mobile phone charge faster, it will affect the service life of the mobile phone battery.
Yes, but the charge rate can not reach 55W
55 watt charger can not charge 40 watt mobile phone, because the 55 watt charger current is very large, 40 watts is incompatible, 55 watt charger is easy to charge the outbreak of heat caused by fire, but the 40 watt charger can charge five mobile phones, that is, the time is slow