Join Date: Feb 2000
Location: Menlo Park, CA, USA
Programs: UA 1MM 0P, AA, DL, *wood, Lifetime FPC Plat., IHG, HHD
Posts: 7,180
I had the 60w, so about the same as the internal battery. It basically will double your power, I got about 7 hours combined, wifi and or other. Running a DVD I got about 8-9 hours total.