Re: Laptop AC Adapters - 65W vs 90W
You are fine with the 90 watt unit. Dell supplies the higher power adaptor when you have the 9-cell battery or a higher power-eating laptop.
The models supported as listed by the supplier are not up to date. My M1530 came with a PA-10 series 90 watt unit, and it's not listed, although the unit is listed as a replacement for the PA-10.