Based on this product's specifications, here are some alternatives and similar models
Battery extra digital for HUAWEI P20 Pro 4000mAh Li‑ion
Summary description:
Replacement Li‑ion battery by extra digital designed for HUAWEI P20 Pro with a nominal capacity of 4000 mAh. Intended to restore device run time, it provides standard voltage and compatibility with the P20 Pro power management. Use for battery replacement in everyday use or to extend phone life; professional installation recommended.