ZeroLemon’s official Amazon store offers its 4700mAh Galaxy S9 and 5200mAh S9 Plus extended battery cases for $27.99 shipped each when code DJBDW5VE is used. This code will work on both batteries. Normally $40, this is the lowest we’ve tracked in a while on these cases and the best available. If you have one of Samsung’s latest smartphones, this is a must-have when going on long trips to keep your phone powered. Rated 3.9+ stars.

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ZeroLemon Galaxy S9 extended battery features:

  • Extend 100% + Power to Galaxy S9 -The powerful 4700mAh Li-polymer extended battery case can effectively provide 100%+ extra battery life to Galaxy S9. Keep your Galaxy S9 all day alive.
  • Sync Phone to Computer – File transfer technology supported. Transferring data and file from your Galaxy S9 to a computer without taking the battery case off. Much more convenient.
  • Full Edge Protection – ZeroLemon Slim Power with soft TPU case offers 360° protection to your phone, protecting your Galaxy S9 from scratches and other daily wears and tears.
  • Intelligent Power Indicator – 4 colors indicate you different battery levels and charging status. Integrated button allows you to choose when to charge for when you need it most. Know before you go.
  • Zero Defect Guarantee – 365 days ZeroLemon Guarantee Warranty with Amazon 30 days Full Refund Guarantee; Lifetime Customer Support from ZeroLemon. 100% Zero Defect Guarantee.

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