Mobile batteries are of-course already mobile devices but how about charging them? Here’s an idea from USBCell.
USB chargeable batteries. They are expensive, they only carry 30-40% of the equivalent cell and they lose 5% capacity per year but for that mobile Bluetooth keyboard or Bluetooth GPS you’ve got for your ultra mobile PC it could mean the difference between working and not working.
However, there seems to be a simpler alternative in this:
or these:
or even this:
What have you got in your Road Warrior Kit as backup power?
Steve / Chippy.
Yes, lets first charge usb batteries from umpc, then when umpc battery is empty just use those charged batteries… unlimited power sourse! ;)