Been following with interest the dynamo roller slippage thread.

I have a CygoLite Rover II system and I like the light it throws onto
the road. I'll be doing some longer tours this year and will most
likely be doing a fair bit of night riding on them. The only problem I
have with the Rover II is the 6 to 8 hours recharge time. he shop I
bought the light from said they'd get me the quick-charger for it but
I haven't seen it yet since I bought the light a few years ago now.

Therefore I seem to have three main options if I want to use the
CygoLite Rover II system on a week to two weeks tour.

Option 1. Buy an extra battery or two of the same 4.8 volts but with
higher amp hours.
Option 2. Get a used Soubitez or Sony roller dynamo and run the light
off of that whilst riding and keep the battery for backupor when
stopped.
Otion 3. Buy a Quick-Charger that's compatible with that lights
battery and charge the battery at a coffee shop or other stop along
the way.

I like Option 2 the best but wonder if it will require a lot of work
to adapt the light to run on a roller dynamo. I am not electricity
literate as I haven't studied the subject since high school. The
CygoLite Quick-Charger for the Rover II recharges a fully drained
battery in 2.5 hours. That's a long time to be sitting in a coffee
shop or other place during daylight hours on a multi-day tour just to
recharge the battery.

What would I need to do to use a Sanyo or Soubitez roller dynamo to
run my CygoLite Rover II headlight? If I recall correctly both of
those dynamos put out 6 volts. So I guess that means that I'd need a
1.2 volt resistor in the system somewhere. Is tht correct?

All perinent advice to this topic is immensely appreciated.

Thanks and cheers