I use 2700mah rechargeables when I am here at home, and have an extra loaded battery holder for the AFD ready to go into service when needed. When I am abroad, I plan on using lithiums due to the lighter weight and they are longer lasting. I do plan on bringing expired batteries back home with me, too. I used to love rechargables overseas, but I found myself always looking for an outlet for other chargers, and this is one less charger to worry about (or pack).