We aren't alone in having Energizer 2.5AH NiMH cells (supposedly made by Sanyo) self discharging at an absurd rate. Check out a discussion on the subject at:
Quote from preceding: "Conclusion: Self discharge of these Energizers is in the order of 25% per day...totally useless. Could be a bad batch, but once bitten twice shy.".
I entirely agree.
Bob