Originally Posted by
larryuva
I'm planning on carrying a gaming laptop with me where the battery says 19.5V * 12.31A = 240Wh.
That's not how it works. V*A = W, not Wh. You need to use the mAh value of your battery to calculate it. I did a quick search and I haven't found any (Alienware) notebook with more than 100Wh.