BLP853 Oppo Reno 4 4G Compatible Battery 3.87V 4400mAh

Oppo Reno 4 4G / Reno 5 Lite — 3.87V Li-Polymer Replacement Battery (BLP853)

This is a 3.87V, 4400mAh (17.03Wh) lithium-polymer cell built to the BLP853 specification. It fits the Oppo Reno 4 4G (CPH2113) and Reno 5 Lite (CPH2205). The physical dimensions are 85.50 × 62.40 × 4.50mm — confirm these against your original cell before ordering.

• CPH2113 and CPH2205 compatibility: Both handsets run the same 3.87V battery rail, share the BLP853 connector pinout, and use the same BMS handshake protocol. One cell covers both models without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a CPH2113 unit. The BMS accepted the charge handshake cleanly, protection thresholds triggered correctly at low voltage, and no thermal anomalies appeared during the charge-to-full cycle.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC in these Oppo devices calibrates its coulomb counter against the cell's discharge curve — fast charging before that baseline is set can produce skewed percentage readings for weeks.

Why the Reno 4 4G reports wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the old cell. When a new BLP853 cell goes in, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts — usually reading higher than reality. One complete slow charge-discharge cycle forces the coulomb counter to reset its baseline against the new cell. After that single calibration cycle, percentage accuracy returns to normal. Do not top up mid-cycle — let the phone drain to auto-shutdown, then charge uninterrupted to 100%.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display fires a high-current draw and the cell cannot hold voltage above the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a calibration problem, not a faulty cell. The BMS trips at roughly 3.0V per cell because the fuel gauge sent no warning. Run the recalibration cycle described above — one full drain to shutdown, one uninterrupted charge to 100%. If shutdowns persist past two full cycles, measure resting cell voltage with a multimeter; a healthy resting cell at 30% reported charge should sit above 3.6V.