There’s a great project for LEGO MINDSTORMS just started on Kickstarter by MinuteBot. BrainPower is a way to plug your NXT into the wall!
Previously, these folks brought us the MinuteBase, a product they designed:
MinuteBot Base is a thick, robust base plate that can be used for construction of robotics based on LEGO Mindstorms.
Now they’re back and they’ve designed something we’ve always wanted: a plug in power supply for the LEGO MINDSTORMS NXT. We do a lot of programming and experimenting with the NXT and we’re constantly running out of batteries. The BrainPower promises to cure that:
MinuteBot BrainPower is a power supply for LEGO Mindstorms-enabled robotics. Say goodbye to batteries. Just plug and play.
See it and support it here!