Xiaomi Redmi Note 6 BN46 Compatible Battery 3.85V 3800mAh

Xiaomi Redmi Note 6 — 3.85V Li-Polymer Replacement Battery (BN46)

This 3.85V, 3800mAh Li-Polymer battery is a direct cell replacement for the Xiaomi Redmi Note 6 smartphone. It matches the BN46 specification and fits the original battery bay without modification. Capacity is rated at 14.63Wh.

• Redmi Note 6 fitment: The Note 6 uses the BN46 cell format — same connector pinout and BMS handshake as the factory unit. The fuel gauge IC on this device reads cell impedance on first boot, so the replacement must match the original voltage curve for the OS to report percentage correctly from the start.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Redmi Note 6 platform. The BMS accepted the charge handshake without error, and the protection circuit triggered correctly at low-voltage cutoff — no runaway charge events observed.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-to-charge cycle before enabling it again. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve, before high-current charging pushes amps into an uncalibrated cell.

Sudden shutdown at 20–30% on the Redmi Note 6 after a cell swap

This is a voltage cliff issue, not a capacity problem. Under modem transmission or full-brightness screen load, the new cell's voltage briefly drops below the BMS cutoff threshold — even when the OS still shows 20–30% remaining. The fuel gauge IC is still calibrated to the old cell's impedance profile, so it misreads how much usable charge is left. One complete discharge cycle from 100% down to automatic shutdown, followed by a full charge, resets the coulomb counter to the new cell's curve and moves the cliff lower.

Phone not powering on after the BN46 cell has sat discharged in storage

Li-Polymer cells discharged below approximately 2.5V per cell enter BMS lockout — the protection circuit opens and blocks current flow entirely to prevent damage. The device will not respond to the power button or show a charge indicator. Connect the phone to a wall adapter rated at 5V/1A or higher and leave it for 15–20 minutes without pressing anything — the charge IC trickle-charges the cell above the BMS re-enable threshold, typically around 2.8V, at which point the circuit closes and normal charging resumes.