Based on this product's specifications, here are some alternatives and similar models
Battery DooGee Y8 Plus 4000mAh Lithium‑ion — replacement battery for DooGee Y8 Plus
Summary description:
Replacement lithium‑ion battery for DooGee Y8 Plus with 4000mAh capacity. Designed to restore or extend device runtime, it fits the DooGee Y8 Plus model and supports standard charging and discharging cycles. Suitable for users needing a straightforward battery swap to regain full mobile performance and longer daily usage between charges.