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Not sure if right forum, but: Huawei P20 Pro battery swelling. Never seen reports of this anywhere. Am I the only one? : r/Huawei
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OEM Battery for Huawei P20
Huawei P20, Honor 10 Battery 24022573 - 3400mAh
Amazon.com: DDONG Replacement Battery HB436486ECW for Huawei Huawei P20 Pro Duos CLT-L29 CLT-AL00 Free Adhesive Tool : Cell Phones & Accessories