Are you still looking for a charger that is powered by AA? If so, try this one.

https://www.amazon.com/SANYO-eneloop...anyo%2Ceneloop

I bought a couple of these, but I only use them to put power into a pair of AA batteries because my GPS uses AA batteries. I have not tried the powerbank mode to take power out of the AA batteries, but it is designed to do that too. Shipping from Japan might take 3 to 4 weeks. It uses a mini USB, not a micro USB cord so you might need to carry two cords, or an adapter.

The big white square thing in my handlebar bag is one of these chargers, I was charging AA batteries with my dynohub.

Second photo, I was trying to charge everything I could. I had them part way open in this photo so you can see one of the AA batteries in each. I was also charging two Li Ion powerbanks in this photo.