I'm looking for a timer socket that you plug into the wall which allows you to specify how long to allow electricity through for. I've got loads of devices that I rarely use because I don't want to leave them on charge for too long as they may overheat/ruin the batteries.
For my normal batteries I have a charger which stops charging when the batteries are full but for other devices I have to use the chargers that come with them, and the manuals specifically state not to leave them plugged in for more than 4/8/16 or whatever hours.
This means that I end up never charging them as I'd have to work out when to plug it in so that I knew that I'd be at home to unplug it again. A normal timer won't really do it as it'd turn itself back on the next day, it could work but I'd rather once it turns off that's it.
I seem to remember seeing a remote control socket that did this but can't remember where.