Gee has it been two years since my last post on this topic?
Just wanted to say that the Tenergy 9v continue to work well, even after misplacing my agilent meter in a box for many months.
On the AA front, I have a mix of Eneloop, Amazon, and Tenergy and they all seem to work well, but I think I would give an edge to the Sanyo Envelops in general.
Scott