Can I Use A 65w Charger Instead Of 90w. Can you use 19V charger 185 V laptop. Youd have to look into the specifications of the laptop.

Youd have to look into the specifications of the laptop. So you could even use a 200W power supply with your PC and the PC will still only use less than 65W. There is a reason the adapter is 180w.
That will do far more to extend the life of your battery than using a 65W charger instead of a 90W charger.
Youd have to look into the specifications of the laptop. Laptop will take the current which it wants. A guide to cross reference ACDC adaptors with Dell laptop models. This means that your laptop when being used can consume a lot of power and once you go past 90w you can easily damage the charger laptop.

