Based on this product's specifications, here are some alternatives and similar models
Battery DooGee MIX 2 4000mAh Li‑ion for portable devices
Summary description:
Replacement Li‑ion battery for DooGee MIX 2 with 4000mAh capacity. Designed for use as a spare or replacement power source in compatible portable devices, it provides extended runtime for daily use, calls, apps and media. Install according to device instructions; intended to restore original battery life and support regular charging cycles.