Changing the battery probably won't solve the problem. There must be something wrong with the phone itself. Also, when the case is opened up, it could be broken too. It would be easier and faster to replace the phone. But on the other hand I don't know where you are from and how they solve such problems.
Here is Why the battery is draining fast on your Huawei P20 lite and the Complete Huawei P20 lite Fast Issue Fix. You can follow the instructions provided below to fix this battery life issue on your Smartphone. About Huawei Huawei is a leading global provider of information and communications technology (ICT) infrastructure and smart devices. … Huawei P20 lite Battery Draining Issue [Fix
After releasing the Power key, immediately press and hold the Volume down key. Keep holding the Volume key till the phone completely boots up. Once the phone boots up, “Safe mode” should
AMAZON EXCLUSIVE MODEL: HUAWEI P20 Lite is an Amazon exclusive Dual SIM smartphone to allow you to enjoy all the benefits of having two phone numbers at the same time High performance with HUAWEI Kirin 659 octa-core chipset, Android 8.0, 3000mAh with Fast Charge, and 4 GB + 64 GB storage
Android 8 with EMUI 8. The Huawei P20 Lite ships with Android Oreo and Huawei's EMUI 8.0 skin over it. Emotion UI is constantly getting better, with behind-the-scenes improvements, like better RAM
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huawei p20 lite battery problems