Initial test. Just used the Chafon dc out (without the AC adapter - hooked two of the DC outs in parallel to get the amperage up) with an upconverter to get to 58.4 volts, i.e., not using the AC charger. It worked. I charged from 67% to 80% in 11 minutes. Chafon still reads 100%.
Since this is one conversion rather than two, it should be more efficient.
Chafon with stock adapter: 12 DC > 110 AC > 58.4 DC (2 conversions)
Chafon with DC up converter = 12V DC > 58.4 DC (1 conversion)
I have pics of all of the above. Will post more after more tests, but this looks good. I really think making a battery with higher voltage and upconverting DC to DC will give the best range for the lowest weight.
Edit: I don't think the Chafon has enough Amperage for this and the parallel connection didn't take. I think I need a better battery.