Can I use RCR-V3 for my GPS?

Hi,  

I found a new battery at:

www.batteryx.com/product/Document/012-PV001/012-PV001.asp?ProductID=1069

This is a new rechargeable Li-ion battery for use with digital cameras. they
claim that you can at least double the number of shots compared to NiMH.
The weird thing is that it only has a capacity of 2000mAh so I wonder about
that claim. (But I understand that the capacity of different battery types
can't be compared directly on the basis of mAh alone)

I have no experience with Li-ion rechargeables (only NiMH) so I have some
questions:

Is this battery also usefull for continuous low-drain purposes?  My GPS uses
about 190 mA so usually I get about 10-12 hours of continuous usage from a
set of 2200 NiMH batteries.  Could I use this RCR-V3 longer than that
continuously? I mean if it would do 15-20 hours that would be ideal!

(Obviously an advantage would be that the RCR-V3 works better at low temps
and has a longer shelf life when charged.)

As far as I can tell from the photo's it will physically fit in my GPS.

Regards, Vincent