Galaxy S9 Battery: Replacement Part EB-BG960ABE / Repair Kit
Amazon.com: Pxwaxpy Battery Case for iPhone 12 Pro Max [6.7 inch], [7800mAh] Portable Protective Charging Case Extended Battery Pack for iPhone 12 Pro Max Charger Case,Grey : Cell Phones & Accessories
Galaxy S9 and S9+ Batteries Likely Same Size as Galaxy S8 Line