Russ, don't forget this handy reference. JP
JP --
Thanks again. I remember that now, but had lost track of it. The battery I have is from my HP laptop. It is approx 4000 mAH and weighs about 12 oz. It will nearly double her usage time, and will cover her pretty much from Atlanta to Tokyo, with time out for a meal and maybe a little nap -- unless she flies Business Class, in which case she's set anyway.
Progress sure is wonderful -- on both sides of the equation: batteries are lighter and the devices use less power. I remember carrying two extra batteries for LA to London, and still couldn't work all the way.
At 12 oz. per battery, I may just buy another one for her. I'll let her decide that. She's a small person and doesn't like to carry too much. It helps that she has an orderly mind. She is keeping notes on usage time and what she was doing during that time. I am particularly interested in full video rundown time. I loaded three 64G USB drives with MP4 Chinese movies for her before she left. Those will help occupy some of her train/bus/plane rides.
Not to be too nostalgic, but when I was flying West Coast to Europe, I probably would have killed for something like the Surface Pro. (Humanely, of course.)
Take care,
Russ