Can I Use A 45w Charger Instead Of 65w. Currently I have a 19V - 342Amps 65W charger connected but it somewhat slows down laptop when it boots up. Just makes sure the voltage on the 65W is close to or the same as the original 45W charger.

Power AdapterWattage Power adapters for Intel-based Apple notebooks are available in 45W 60W and 85W varieties. That will depend on the laptop model. And the current rating on the charger tells the maximum current it can deliver to a laptop.
This will be totally waste of money and its never recommend.
If needs a new one pls provide a link bcoz i can only find link for 65W charger or above. Yes you can always use higher wattage Dell chargers with Dell systems. And the current rating on the charger tells the maximum current it can deliver to a laptop. Can I use 65W charger on Surface Pro 6 the one it shipped with is 45W ok kind of a Noob question but I purchased a backup charger for when I accidentally leave the normal one in the office.

