Xiaomi BP48 Redmi K50 Gaming Replacement Battery 7.74V

Xiaomi Redmi K50 Gaming Edition — 7.74V Li-Polymer Replacement Battery (BP48)

This is a 7.74V, 2300mAh (17.8Wh) lithium-polymer cell for the Xiaomi Redmi K50 Gaming Edition, Redmi K50G, and Redmi K50G Mercedes-AMG Petronas. It fits directly behind the midframe where the original BP48 sits. Swap it in when the original cell no longer holds charge or shuts down unexpectedly under load.

• Redmi K50G and K50G Mercedes-AMG Petronas fit: All three variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The BP48 part number covers all three without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a K50G board. The BMS accepted the cell, protection thresholds fired correctly at the low-voltage cutoff, and the charge IC reached full termination without error flags.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. The Snapdragon 8 Gen 1's fuel gauge IC uses a coulomb counter calibrated to the previous cell's discharge curve — running one slow cycle before enabling 120W fast charging lets it recalibrate against the new cell.

Sudden shutdown at 20–30% on the Redmi K50 Gaming Edition

The K50 Gaming Edition runs a Snapdragon 8 Gen 1 with a high-frequency display and active cooling fan — peak current draw spikes hard during gaming sessions. A degraded or freshly installed cell with uncalibrated state-of-charge can hit its internal voltage floor while the fuel gauge still reads 20–30%. The BMS interprets this as a hard undervoltage condition and cuts output immediately. One full slow discharge cycle corrects the coulomb counter and brings reported percentage in line with actual cell voltage.

USB-PD or 120W fast charge not accepted after a cell swap

Xiaomi's HyperCharge negotiation runs a handshake between the charger, the charge IC, and the BMS on the new cell. On the first cycle after installation, the BMS may not complete that handshake cleanly, and the phone falls back to standard 5V charging. This is not a faulty cell — it is the BMS initialising against an uncalibrated coulomb counter. Discharge the phone fully to auto-shutoff, charge to 100% at standard rate, then reconnect the 120W adapter. Fast charging should negotiate correctly from that point.