Oppo K10x 5G Replacement Battery BLP965 3.87V 4800mAh

Oppo K10x 5G / PGGM10 — 3.87V Li-Polymer Replacement Battery (BLP965)

This is a 3.87V, 4800mAh (18.58Wh) Li-Polymer battery for the Oppo K10x 5G (model PGGM10). It replaces OEM part BLP965 and restores power to the phone's display, modem, and processor when the original cell has degraded or failed. Dimensions are 93.80 × 64.40 × 4.50mm — verify against your existing cell before installation.

• K10x 5G / PGGM10 fitment: Both model variants share the same BLP965 cell footprint, connector pin-out, and BMS handshake protocol. Swapping within this group requires no firmware changes — the charge IC reads the same cell identification registers.
• Bench tested on actual hardware: We ran the BLP965 replacement through a full charge cycle on K10x 5G hardware. The BMS accepted the charge handshake on first connect, thermal cutoff thresholds triggered correctly, and the fuel gauge IC registered the full 4800mAh rated capacity after one complete cycle.
• First-cycle fast charge protocol: On first use after installation, disable SUPERVOOC or any fast-charge mode for one complete discharge-charge cycle. The fuel gauge IC needs to map the new cell's discharge curve at standard current before high-rate charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the BLP965 replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell may hit a voltage cliff — dropping below the modem's minimum supply voltage under 5G radio load — while the OS still reads 25% remaining. The phone cuts out to protect the SoC, not because the cell is faulty. One full discharge to automatic shutdown, followed by an uninterrupted charge to 100%, resets the coulomb counter against the new cell's actual curve.

OS reporting wrong battery percentage after cell swap

The Oppo K10x 5G uses a coulomb counter that tracks cumulative charge in and out against a stored cell model from the original BLP965 unit. After a cell swap, that stored model no longer matches the new cell's internal resistance or capacity curve, so percentage readout drifts — often reading 100% too quickly or stalling at a fixed number. Force a full recalibration cycle: drain the phone to automatic shutdown, then charge in one session to 100% without interruption. After that cycle, percentage tracking stabilises. If drift continues beyond two full cycles, check that the battery connector is fully seated — a partial connection raises apparent cell impedance and corrupts coulomb counter readings.