Using disposable batteries are not only harmful to the environment but also an inconvenience. Imagine losing power when you are in the middle of using the battery powered electronic and you don't have any extra batteries in your tool kit. Charging or plug-in power for electronics is easier and more convenient.
If you want to know how to convert those battery powered electronics to run on AC check out DIYHacksAndHowTos Instructions below.
The instructioins may appear a little complicated, but once you are doing it you may find it easy to do. It use a a voltage regulator circuit, a switch, and a dummy battery system to fill the space. The dummy battery also makes the whole thing removable in case you want to revert back to the batteries.
Just a precaution, always be careful when working with electricity.
Here is the full guide:
http://www.instructables.com/id/Convert-Battery-Powered-Electronics-to-Run-on-AC/?ALLSTEPS
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This looks good, I will have to check this out.
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