Nintendo are set to release the Wii U GamePad battery and remote charging pack in Europe shortly.
Various retailer listings, spotted by NeoGAF earlier this week, point to a September 27th release in some regions, with October 4th stated by Amazon Germany.
The GamePad's capacity would then increase from 500mAh to a far juicer 2550mAh, bringing with it an estimated lifespan of five to eight hours on average - with a price point of €29.99.

The charging cradle offers a large play time for a short charge, rolling in at around nine minutes for an hour's use and 90 minutes for 13+ hours. Interestingly, the cradle/dock uses the same Nintendo 3DS charger for easy hot-swapping of devices.
Will you upgrade your Nintendo Wii U/Wii power next month?