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I have one of those. It's called a Gomadic. Almost certain @frank9755 uses one.
Mine has never been used of course, just another item in my panic buying frenzy before TCR last year.
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Gomadic
Yes I used two in the ipwr. It meant I could run both my phone / GPS and my lights off either power banks or AAs. I needed to recharge in a hotel only every fifth night, with AAs kicking in if I went longer.
Dynamos are so overrated!
At my power output they are a luxury item.
Mike set the TABR record without a dynamo, Josh ibbet won TCR without one .
Etc, etc...
Heh... just Googled and found AA battery to USB charger adaptors. Meaning it's cheap and easy to buy shitty batteries as you go along, and to charge USB devices from those.