POCO F3/Redmi K40/K40 Pro/K40 Pro+/Mi 11X/Mi 11X Pro (BM4Y) Li-Po Replacement Battery
The Xiaomi BM4Y is a rechargeable lithium-ion polymer battery designed as an OEM replacement for several Xiaomi and Poco flagship smartphones. With a typical capacity of 4520mAh, this high-performance internal battery delivers reliable power output, efficient charging, and long-lasting daily usage for compatible devices. Built with advanced Li-po technology, the BM4Y supports stable energy management and optimized smartphone performance.
Specifications
- Brand: Xiaomi
- Model Number: BM4Y
- Battery Type: Lithium-ion Polymer (Li-Po)
- Typical Capacity: 4520mAh / 17.4Wh
- Rated Capacity: Approx. 4420mAh / 17.1Wh
- Nominal Voltage: 3.87V
- Charging Voltage Limit: 4.45V
- Compatibility:
- Xiaomi Poco F3 / Poco F3 5G
- Xiaomi Redmi K40 / K40 Pro / K40 Pro+
- Xiaomi Mi 11i 5G
- Xiaomi Mi 11X / Mi 11X Pro