Hyperkin’s 3DS Powerplus, another accessory promising to double the 3DS’ battery life, and add an extra 2.2 ounces and 1/4” to its thickness (click for a larger image).
Like the Nyko Power Pak and Newbie PowerPlay, this p-p-p-power boost also boasts an “improved grip”. The slip-on battery pack will release this summer for $19.99.
In related news, did you know there’s a homebrew app built to measure how long your DS and 3DS battery last under various testing modes? Seems perfect for doing comparison tests of all these third-party accesories (though using a flashcart to run this software will likely deplete your battery faster).
See also: More accessories