Redmi BP48 K50 Gaming Edition Replacement Battery 7.74V 2300mAh

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

This is a 7.74V, 2300mAh Li-Polymer replacement battery for the Redmi K50 Gaming Edition (K50G), including the K50G Mercedes-AMG Petronas variant. Part number BP48. It replaces an original cell that has degraded through repeated charge cycles or can no longer sustain load under normal use.

• K50G and K50G Mercedes-AMG Petronas fit: Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol — BP48 covers the full K50G lineup without modification.
• Bench tested on actual hardware: We ran BP48 through charge and discharge on K50G hardware. The BMS accepted the cell, reported state-of-charge correctly after one full cycle, and thermal readings stayed within normal range across the charge window.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before high-current fast charging is introduced into an uncalibrated system.

Sudden shutdown at 20–30% on the K50G after a cell swap

This is a voltage cliff issue, not a capacity fault. The K50G's processor and display draw enough current under load that a new cell — before the fuel gauge IC has recalibrated — can drop below the BMS cutoff threshold while the OS still shows charge remaining. The fuel gauge IC was calibrated to the old cell's internal resistance curve. Until one full discharge-charge cycle is complete at standard rate, the reported percentage and the actual cell voltage diverge under high-draw conditions. Run that first cycle with the screen at moderate brightness and background apps closed to give the coulomb counter a clean baseline.

USB-PD fast charge not activating on the first cycle after replacement

After a cell swap, the charge IC on the K50G may not handshake with the fast charge protocol on the first plug-in. This happens because the BMS enters a conservative charge mode when it sees an unfamiliar cell state — it defaults to standard current until it completes an initialisation pass. Plug into a standard 5V charger for the first full charge cycle rather than the fast charger. After that cycle, fast charging should negotiate normally on subsequent connections.