Another clue that the Galaxy S6 will feature a 2,600-mAh battery
Samsung Galaxy S5 Original Battery - Walmart.com
Amazon.com: Galaxy S5 Battery,Upgraded 7800mAh Extended Battery [Up to 3X Extra Battery] with Black Protection Cover & Case for Samsung Galaxy S5 All Versions : Cell Phones & Accessories
New For Samsung Galaxy Note7 SM-N935F/DS EB-BN930ABA EB-BN935ABE Battery 3500mAh | eBay