Here's an example of my setup piggy backed on to the battery a friend of mine carries into the bush to run his sleep apnia machine or CEPAC.
A few words of wisdom.
Find a battery charger that uses a 12 volt DC input ( check the labeling on the power supply).
Try running your panel directly in to your battery charger (for AA)
Or, get a 175 watt inverter and just plug in your regular charger. I have a number of possible configurations I use, but the most reliable and efficient is to the 12 solar output to 12 volt charger for AAs. A six watt panel will charge 4 AAs in an afternoon. You have to test first though, not every 12 volt input charger will work with your solar panel and I don't really know why. I just know you have to test your setup thoroughly before you head off into the wild. If you want, I'll take pictures of and post a couple of working setups for you. One that I have used successfully.