For about one year, Energizer Ni-MH cells that are made in Japan are "pre-charged" and a charge lasts for 6 months or more. Sanyo also has Ni-MH cells that hold a charge for a long time. Maybe Sanyo makes cells for Energizer. The AA cells are 2450mAh.
I stopped using Ni-MH cells about a year ago because of the rapid discharge when not in use.
I switched to the Sanyo eneloop cells for all of my digital cameras and have had very good results.