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VPROOF via Amazon has 2 iPhone X Battery Case on sale. FS for Prime.

iPhone X 3600mAh Battery Case($ 18.99) : 24% off w/code ✄ HGRJ6UBU
https://www.amazon.com/dp/B075JNGDHT

iPhone X 5000mAh Battery Case($ 18.95): 21% off w/code ✄ SWDXR4TF
https://www.amazon.com/dp/B077GQ9WCZ

Features:
★4 Level LED Power Indicator–Featuring with the LED battery level indicator, Vproof battery case could let you know exactly the power charged or left (0–25%–50%–75%–100%); Besides, you could just start or stop charging your phone with the power switch easily