Charge life on a cycle trip.

I'm planning a trip on the C & O Canal near Wahington, DC, 184 miles, 
averaging 30-40 miles a day at about 8-9 MPH, and will be using my TT & 
GPS, does anyone know of a way to maintain battery charge?  Weight is a 
very large concern as everything will be on my back - there's no 
luggage space on a Coker unicycle (that's why only 8-9 MPH) and every 
gram will sit on the front of my, um, seat, causing that part o` me bum 
to go numb (that's why only 30-40 MPD).  There will be at least one 
overnight where there will be no outlets available (primitive camping) 
and, short of a really long extension cord, I worry that the TT (and 
the GPS for that matter, but it's got a longer charge life) won't last 
for the whole day.  I'm already planning on having the back-light and 
the beam receive turned off, but bluetooth will be required to 
communicate with the GPS.

I've already considered solar - although they are either very brittle 
or large - and may have to go that route.  Has anyone measured the 
current draw of a TT after it's fully charged and on?




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