I use several Nikon SB-900 and SB-700 strobes for my photography work. Both these units use four AA batteries and the batteries drain like crazy. I was using your typically brand-named batteries for a while… and, well… they sucked. They wouldn’t hold a charge over time and they would drain rapidly when in use. I got so frustrated I jumped online and started looking for a new brand. I did most of my research on Amazon.com and came across two brands: PowerEx and Eneloope. Both brands received positive ratings and, for whatever reason at the time, I decided to go with the PowerEx. That was a year ago, and I have to report, they haven’t let me down since. They are reliable, hold almost a full charge after sitting around for weeks in a camera bag, and in a pinch you can charge them to full capacity in one hour.