OPPO F11 Pro BLP697 Replacement Battery 3.85V 3900mAh

Oppo F11 Pro / CPH1969 — 3.85V Li-Polymer Replacement Battery (BLP697)

This is a 3900mAh (15.02Wh) lithium-polymer cell that replaces the OEM BLP697 battery inside the Oppo F11 Pro (CPH1969). It fits the internal battery bay directly and connects to the phone's charge IC and fuel gauge via the original flex connector. Voltage is 3.85V nominal — identical to the factory cell.

• F11 Pro and CPH1969 fitment: Both model designations refer to the same hardware — CPH1969 is Oppo's internal board code for the F11 Pro. The battery bay dimensions, connector pinout, and BMS handshake protocol are identical across both. No modification needed to fit either variant.
• Bench tested on actual hardware: We cycled this cell through the Oppo charge IC and confirmed BMS communication was accepted on first connection. The fuel gauge IC registered cell presence and began coulomb counting from zero — no error flags or charging interruption detected at the controller level.
• Fuel gauge recalibration on first use: After installation, disable VOOC fast charging for one full discharge-charge cycle. The fuel gauge IC calibrates its discharge curve against the new cell under low current. Running fast charge into an uncalibrated cell causes the coulomb counter to build inaccurate state-of-charge data from cycle one.

Sudden shutdown at 20–30% on the F11 Pro after a cell swap

This is a voltage cliff issue, not a capacity fault. When the modem transmits or the AMOLED panel peaks in brightness, current draw spikes sharply. A new cell whose fuel gauge IC hasn't completed a calibration cycle can report 25% remaining while the actual cell voltage has already dropped below the BMS cutoff threshold under load. The phone cuts power to protect the cell — the percentage shown at shutdown is meaningless until one full cycle is complete. Run one uninterrupted discharge to auto-off, then charge to 100% without interruption before normal use.

VOOC fast charge not activating after battery replacement

Oppo's VOOC protocol requires a handshake between the charger adapter, the charge IC on the board, and the battery's BMS. On the first cycle after a cell swap, the charge IC sometimes defaults to standard 5V/1A input until it has completed one full charge cycle with the new cell's BMS. Plug in the original VOOC adapter, let the phone charge to 100% without unplugging, then restart the device. VOOC detection typically resumes on the second charge cycle once the charge IC has logged a completed session with the replacement cell.