A modified wireless optical mouse. Though rechargeable, eventually the NiMH cells WILL have to be replaced, I have had to recharge every day, and even though I make that as quick as can be (using an Energizer 15min charger) like I said, the batteries eventually will need replacing. Now this Compaq mouse did not come with an ON/OFF switch nor' does it even have the eventual sleep/auto off on idle feature. However, it wouldn't ever get to do the 'auto off' even if it could, seeing as to it's always gravitating towards me on the sofa which I (we) mainly reside. & I know for a fact that an ON/OFF switch wouldn't EVER get used by me, and definitely not as much that it would have noticeable effects in regaurds to power saving.
So like the 'auto off' or 'off while idle' feature that some mice provide, I thought of making it only powered when I'm actually using it, but to improve on the concept, instead of it waiting a predetermined amount of time while not being 'moved' to shut off, and once 'moved turning on again (like I said, with me, it'sa always getting sat on, pushed aside, sliding in towards me on the cushion when I sit, etc..)
FAST>>FORWARD
These Pictures show the VERY SIMPLE process of my successful mod that makes it so ONLY when you have ur hand placed on the mouse like when ur using it (NOT WHEN ITS JUST MOVED)
I salvaged as many different micro contact switches from various electronics I have strewn about my room. I decided to go with the switch that is the closest one to the bottom of the picture of switches. I then placed my hand on the mouse and held it in just about every workable position I would ever hold it in, and found the best spot possible to mount the switch where it would always get pushed down when I am using the mouse.
Also, those speed chargers wear them out faster, you want to charge the batteries slower.
So far my mouse has kept up with me, even during the long days where I have forgotten to put it back in the cradle. Perhaps the M28WC
( http://www.acesuppliers.com/company/information.asp?pid=9395 ) has a better charging system, but I wouldn't really know. It's the only one I've had. If it starts to die out on me, I may do this though. Thanks for the idea.