thought i'd report an interesting and maybe useful observation.
like many here i like to "play"..i recently converted a mains 24 hour timer to a one hour (actually 45 minute) timer with set points of 50 seconds each...but not the point of this post.
after changing the mechanical gear ratio and re-assembling the timer i found myself looking for something to plug in to it to give it a run. ended up finding an old Nokia cell phone and charging adapter. this phone battery was "dead".. has been several years since i gave up on it as the battery would not charge AT ALL..anyway i pluged it in just so i could hear the beep of it going on/off every other 50 second cycle to know from the next room that my timer was working.
well after two days on the timed charger the darn thing (3.6v Ni-MH) seems to have recharged and is holding a charge! anyone think it was the start/stop of the recharging that did it? or perhaps the long period of dormancy? or something else?