Battery Case for Galaxy S8 Plus, Upgraded 6500mAh Portable Rechargeable Charger Case Extended Battery Pack for Samsung Galaxy S8 Plus Protective Charging Case for Galaxy S8+(6.2 inch) -Black - Newegg.com
Galaxy S8 and S8+ batteries photographed - 3,000mAh and 3,500mAh it is, then - GSMArena.com news