ZeroLemon Official (99% positive feedback) via Amazon offers its 4000mAh iPhone X MFi Battery Case for $14.99 Prime shipped when promo code G9ERCYYD is applied during checkout. You can upgrade to the 8000mAh model for $19.99 with the same code. That’s good for 50% off in both instances, and $10 less than our previous mentions. This is an easy way to add extra juice to your iPhone X without breaking the bank. Rated 3.7/5 stars.

ZeroLemon iPhone X Battery Case features:

  • Extend 100%+ Power to iPhone X – The powerful 4000mAh Li-polymer extended battery can effectively provide 100%+ extra battery life to iPhone X, which is equivalent to add 12 + hours talk time or 7+ hour’s movie time.
  • Apple Certified Connector: Built-in Apple Certified Connector works with all functions with your iPhone X charging case. 100% compatible with iOS 11, Apple Pay, and future iOS software updates.
  • Ultra Slim Protection – ZeroLemon Slim Juicer protects your iPhone X from scratches and other daily wears and tears, yet small and convenient enough to fit easily in your hand or pocket. Please note wireless charging is NOT supported by this battery case.

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