I've recently given all of my batteries run through the 'break-in' mode of my Maha C-9000 to freshen them up and get an idea of their performance. Oddly three of my Eneloop AAA cells, all the same date code (06 09 TE), have lost major capacity.
I thought this might be a fluke and ran them through the 'break-in' mode three times with little change in measured capacity.
All of these cells have been used in low drain devices (a rear blinking bike light and small powered speakers for an MP3 player) and have only been charged on the C-9000. I don't know exactly how long I've had them, but it can't be more than two years.
Below are the measured capacity from a run through the C-9000 'break-in' mode when new and now.
800 - 674
799 - 670
790 - 656
Has anyone else experienced this? Any idea why these cells which have been well cared for should have such a large loss of capacity?