Based on this product's specifications, here are some alternatives and similar models
Smartphone battery Lenovo BL-270 for K6 Plus, 4000 mAh capacity, replacement battery
Summary description:
Replacement battery Lenovo BL-270 designed for the K6 Plus smartphone. Lithium-ion battery with 4000 mAh capacity provides extended runtime for calls, browsing and apps. Intended for users needing a direct OEM-compatible swap to restore device autonomy. Suitable for repairs and DIY replacement; follow safety and installation instructions.