Larger battery?

hey I'm just scrolling through eBay and found some people offering 256gb SSD iPods with 2000mAh batteries this just doesnt seem possiblie if it is hwere can i get this battery \


here is the link

2000mAh+SSD 240 GB /256GB Thin iPod Classic 7th Generation 160 GB (Latest Model) | eBay

via iLounge Forums http://forums.ilounge.com/ipod-classic-legacy-ipods/282133-larger-battery.html