Wait, you mean ... someone actually invented that? Interesting.
Apparently, for the price of 4,980 yen (or $43 USD) and just a smidge of dignity, you can use this bracelet to add 15 to 20 hours of battery life to your Nintendo DS. The Charger Bracelet is only one of many battery accessories for the DS, but it's good on the go and comes in handy if you don't want to bulk up your handheld. This nifty tool from Thanko is also compatible with the PSP and certain mobile phone models of the Japanese variety.
Before we pick this up, we'll be waiting for a necklace that plugs into our bracelet and earrings that to plug into our necklace, so that our batteries will last our entire lifespans. Or maybe we're just in it for the sweet bling.
By the way, you have to love the Google translator. The translated page for this product boasts, "Do a game, fight leprosy!" Why, I think we just might.