I have a device that will literally suck two Energizer lithium AA batteries dry in a half a day. So, it looks like I need a rechargeable batteries for sure. I know that the second generation Sanyo eneloop are supposed to be very good. But, just wanted to make sure there isn't something that could last longer (even if there might be a side-effect some people may not like).
I also need a good charger. I heard that slow charge ones make the battteries last longer. However, if it means I would sacrifice a little bit of life from the batteries, I may be willing to deal with that.