The upcoming 3DS Circle Pad Pro has a battery life of 480 hours on ONE Triple A Battery!
The device was released on December 10th in Japan, and adds a second analog stick (or a “Circle Pad” as their called) onto the Nintendo 3DS, alongside an additional trigger button.
Thankfully you won’t be needing that screwdriver that is required to open the battery compartment much, since the 490 hours battery life on one AAA Battery should be good for quite a long time. The Circle Pad will also come with a strap.
In Japan the Circle Pad was released bundled with Monster Hunter 3DS.
Here’s a trailer for Monster Hunter Tri 3G for 3DS.
Via Andriasang