Are you reading this charge value off the pager that was designed to use alkaline cells? NiMH batteries have a nominal voltage of 1.2V, and the discharges is fairly flat compared to alkalines. Alkalines have a nominal voltage 1.5V. If the pager is measuring the voltage of the battery to determine charge, it's going to read incorrectly if it was designed for alkaline cells.
I love Sanyo Eneloops. I use them in everything, and they have a cool white design.