Can 40w charger charge 18w fast charge mobile phone? Agreed.
Yes, if it is an ordinary mobile phone, it will be charged in accordance with the ordinary charging method, which has no effect on the mobile phone. It is not recommended to use a low-power charger for a long time to charge a compatible high-power mobile phone
No, the mobile phone charger as far as possible to use the original charger or model specifications match the charger, if the 40w charger can be charged faster than the original 18w charger, but this has damage to the mobile phone battery and there are security risks.
This is definitely not possible, 40 watts of charger for 18 watts of mobile phone battery, the power is too large, to charge the mobile phone, will lead to an increase in battery heat, easy to make the battery short circuit, and even fire and other safety hazards.
Can be charged, use a high-power charger to charge a low-power mobile phone, because the mobile phone's protection function is limited (overcurrent protection), there will be no problem, but there will be no corresponding fast charging effect, or it is recommended to use the original charger.