Redmi 10 Prime BN63 Compatible Battery 3.87V 5400mAh

Redmi 10 Prime — 3.87V Li-Polymer Replacement Battery (BN63)

The BN63 is a 3.87V, 5400mAh (20.9Wh) Li-Polymer cell for the Redmi 10 Prime (model 22011119TI). It replaces the original battery when the existing cell has degraded through repeated charge cycles or can no longer hold a usable charge. This is a direct cell swap — same voltage, same capacity, same connector footprint.

• Redmi 10 Prime and 22011119TI compatibility: Both model references share the same battery bay dimensions, the same flex connector, and the same BMS handshake protocol. The BN63 part number covers both — no variant differences in connector or charge IC communication.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Redmi 10 Prime unit, confirming the BMS accepted charge without fault flags and the fuel gauge IC registered cell capacity correctly after one complete cycle.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC is still calibrated to your old cell's discharge curve. Running one full cycle at standard charge current lets the coulomb counter reset against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on a replacement cell

This happens when the fuel gauge IC still holds the old cell's voltage-to-capacity curve in memory. A fresh 5400mAh cell has a different discharge profile, so the reported percentage and the actual cell voltage diverge under load. When the modem transmits or the screen peaks in brightness, the cell voltage drops faster than the gauge predicts, and the power management IC cuts power before the displayed percentage hits zero. One full discharge-charge cycle with fast charging off forces the coulomb counter to relearn the curve and brings the shutdown threshold back into alignment.

USB fast charging not activating after cell replacement

On the first cycle with a new cell, the charge IC sometimes fails to negotiate the proprietary fast-charge handshake — it defaults to standard 5V charging instead. This is not a fault with the replacement cell; it is the charge controller being conservative with an uncalibrated BMS. Complete one full standard charge cycle first. On the second charge, the handshake should complete normally and fast charging will activate — confirm by checking the charging indicator in Settings, which should show the fast-charge icon at a charger output above 9V.