Galaxy S9 and S9+ Batteries Likely Same Size as Galaxy S8 Line
Replacement for Samsung Galaxy S9 Battery 3000mAh
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100% Brand New Original 3500mah Eb-bg965aba Battery For Samsung Galaxy S9 Plus S9+ G965 Mobile Phone - Mobile Phone Batteries - AliExpress
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Amazon.com: Battery Case for Samsung Galaxy S9,[6000mAh] Portable Charging Case External Battery Pack for Samsung Galaxy S9 Rechargeable Charger Case Backup Power Bank(5.8 inch) : Cell Phones & Accessories