Yes, you can use a 90 watt ac adapter, a.k.a power charger, for your 65 watt-compatible laptop. It will actually charge your battery faster. But, and this is a big but, you cannot use a 19 Volt ac adapter on an 18.5 Volt-laptop. It will be too powerful and burn right through the port and motherboard eventually, frying your laptop. You will need to replace your motherboard which is costly.
You’ll also need to make sure your ac adapter port is compatible with the laptop jack. This is easy to figure out. If it doesn’t fit, don’t use it! Some ac adapters are interchangeable, such as Dell support ac adapters work with some Lenovo and HP laptops while some Toshiba support ac adapters fit into Acer laptops.
If you are not sure if your ac adapter is compatible, you should ask a local nyc computer repair shop. Better be safe than sorry.
