Redmi Note 13 Pro BM5V Replacement Battery 3.91V 5000mAh

Redmi Note 13 Pro — 3.91V Li-Polymer Replacement Battery (BM5V)

This is a 3.91V, 5000mAh (19.55Wh) Li-Polymer replacement battery for the Redmi Note 13 Pro smartphone. It replaces OEM part number BM5V and restores full device function when the original cell has degraded or failed to hold charge. Capacity matches the factory specification from the product data above.

• Note 13 Pro fit: The BM5V cell uses a specific connector pinout and physical footprint tied to the Note 13 Pro chassis. The BMS on this replacement communicates with Redmi's charge IC over the same data lines, so the phone accepts the cell without throwing charge-cycle errors.
• Bench tested on actual hardware: We ran the BM5V through a full charge-discharge cycle and confirmed BMS handshake with the Redmi charge controller. Voltage held above 3.6V under display and modem load, and the cutoff protection triggered cleanly at the low-voltage threshold.
• Fuel gauge recalibration after install: On first use, disable fast charging and run one complete discharge down to automatic shutdown, then charge to 100% on standard 10W. This gives the coulomb counter IC a clean reference curve against the new cell before Turbo Charge pushes high current into an uncalibrated state.

Why the Note 13 Pro reports wrong battery percentage after a cell swap

The fuel gauge IC on the Note 13 Pro builds its percentage model from the discharge curve of the cell it last calibrated against. When you install a new BM5V cell, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The result is percentage readings that jump or freeze — commonly stalling near 50% or dropping suddenly near 20%. One full discharge-to-shutdown followed by a complete charge resets the coulomb counter and gives the IC an accurate curve to work from.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff failure — the cell's terminal voltage drops below the modem or display's minimum supply rail under load, even though the fuel gauge still shows charge remaining. On an uncalibrated cell, the IC underestimates how steeply voltage falls during high-draw bursts like 5G radio or screen wake. The BMS triggers an emergency cutoff before the gauge reaches zero. Complete the recalibration cycle described above — one full discharge to shutdown, then charge to 4.20V — and the shutdowns should stop.