Based on this product's specifications, here are some alternatives and similar models
Battery DooGee X50 3000mAh Li‑ion for portable devices, model X50 Battery
Summary description:
Rechargeable Li‑ion replacement battery for DooGee X50 with 3000mAh capacity. Designed for use in compatible portable devices, it provides standard runtime and straightforward installation. Suitable for users who need spare or replacement power source to restore device operation, carry as a backup, or replace a worn battery.