In a response from a manufacturer I got info on a 2200 mAH Universal Portable Battery Stick, as small as a thumb they write.
It is slightly wider than a normal (flat) USB plug and aboiut as long as two of these plugs, to give you an idea.
The battery supplies 5V.
With a mini USB plug this would fit to a MT and almost triple the battery time. (1150+2200).
Shenzhen Herocell Technology is the manufacturer. The
www.herocell.com domain appears to be not up.
Anyone knows about availability?
Similar products?