Based on this product's specifications, here are some alternatives and similar models
Battery for Sony Xperia X F5121 LIP1621ERPC 2620 mAh Li-ion by extra digital
Summary description:
Replacement Li-ion battery compatible with Sony Xperia X F5121 (model LIP1621ERPC) with 2620 mAh capacity. Designed to restore device runtime for calls, apps and media playback. Intended for users needing a direct OEM-spec power unit for maintenance or battery replacement. Fits the specified model and supports standard charging and usage profiles.