All:
There are about 8,000,000 threads with solar questions and answers so I am starting this one just to state what worked for me without anyone having to dig through all the threads.
I was able to get the Auroa Solar CF101A with the USB adaptor. I went with the USB adaptor since I also have a car charger that used a USB interface to the Axim.
Anyhow ~ in good sun it appears that I get around 20% per hour with the standard battery. The Axim, at least in the case of the X51V, does need to be turned off for the unit to take a charge.
The charger was $49.95 and the adaptor was around (can't remember) $7 to $10. Basically for $60.00 the Sun can keep my Axim going and since I have a window in my office, I am nearly always good to go. My personal opinion - CF101A is a good choice.
The gentleman at Aurora Solar was prompt to ship my order and was helpful in helping me select the right adaptor for my needs. If this was EBay I would give this experience a 100%.
Link ~
http://www.aurorasolar.com/aurora2/C...r_Charger.html
Good luck all.