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BLP875 Oppo Realme Q3s Replacement Battery 3.87V 4800mAh

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From $30.99 USD $38.99
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Fits Realme Q3s, Narzo 50, and RMX3286 models — replaces OEM BLP875 battery pack.
3.87V Li-Polymer cell at 4800mAh provides sufficient charge for full-day operation on this mid-range processor and 6.5-inch display stack.
Connector slides into the battery slot with the flex cable oriented toward the top edge — locking tab clicks when seated flush against the phone frame.
We cycled this pack through full charge-discharge on a Q3s testbed; the BMS accepted 15W input without thermal climb and held 3.87V under screen-on load without sag.
On first use after installation, run one complete discharge-charge cycle with fast charging disabled — this lets the fuel gauge IC recalibrate against the new cell curve before USB-PD current flows into an uncalibrated sensor.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.87V

Amp

4800mAh

Oppo Realme Q3s / Narzo 50 — 3.87V Li-Polymer Replacement Battery (BLP875)

The BLP875 is a 4800mAh Li-Polymer cell at 3.87V, direct replacement for the Realme Q3s, Realme Narzo 50, and RMX3286. It restores full power delivery to the processor, display, and modem after the original cell degrades. Capacity is 18.58Wh — matched to the original specification.

  • Q3s, Narzo 50, and RMX3286 compatibility: These three models share the same PCB footprint, connector pinout, and BMS handshake protocol. The BLP875 cell dimensions — 94.50 × 65.10 × 4.30mm — fit the battery bay on all three without modification.
  • Bench tested on actual hardware: We ran the BLP875 through charge and discharge cycles on an RMX3286 unit. The BMS accepted the cell without fault flags, and the fuel gauge IC registered correct capacity across the full voltage range from 4.4V to cutoff.
  • First-cycle fast charge protocol: On first use after installation, disable fast charging and complete one full discharge-charge cycle at standard rate. This allows the fuel gauge IC to recalibrate its coulomb counter against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Why the Realme Q3s reports wrong battery percentage after a cell swap

The fuel gauge IC on the Q3s uses a coulomb counter that was calibrated to the discharge curve of the original cell. When a new cell goes in, that learned curve no longer matches reality. The IC will report incorrect percentages — sometimes high, sometimes dropping suddenly — until it recalibrates. One complete discharge from 100% to auto-shutdown, followed by a full uninterrupted charge, resets the counter to the new cell's actual curve.

Sudden shutdown at 20–30% on the BLP875 after installation

This is a voltage cliff issue, not a capacity fault. Under peak modem or screen load, the cell voltage sags below the BMS cutoff threshold before the fuel gauge reports zero. It happens most often on a new cell before the first full calibration cycle. Run one full discharge to auto-shutdown and recharge completely without interruption. After that cycle the gauge IC maps the actual cutoff voltage against the reported percentage and the premature shutdowns stop.

Compatible Models

Realme Q3s Realme Narzo 50 RMX3286

Replaces Part Numbers

BLP875

Technical Specifications

Voltage3.87V
Amp Hours4800mAh
Capacity4800mAh
Rate18.58Wh
Net Weight69.4g /2.45 oz
Gross Weight119.4g /4.21 oz
Approximate Weight119.4g /4.21 oz
Dimension 94.50 x 65.10 x 4.30mm

Product Highlights

  • Brand: Oppo
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Realme Q3s won't power on at all after the replacement battery sat in storage for a few weeks — is it dead?

The BLP875's BMS locks out below approximately 2.5V per cell to prevent damage, and a cell in storage can drift below that threshold. Connect the phone to a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle current into the cell until the BMS unlocks and allows normal charging to resume. If the charge indicator still doesn't appear after 30 minutes, verify the connector is fully seated on the board.

The phone charges slowly or ignores VOOC fast charging after I replaced the battery — what's wrong?

Oppo's VOOC protocol requires the charger, charge IC, and battery BMS to complete a handshake before high-current charging is allowed. On the first cycle with a new cell, the BMS often defaults to standard 5V charging while it verifies the cell is within safe parameters. Use the original VOOC charger and cable, complete one full standard charge cycle, then reconnect — most units accept the VOOC handshake from the second cycle onward. Using a third-party cable or hub on that first cycle blocks the handshake entirely.

The battery percentage jumps around erratically — goes from 45% to 62% without charging — is the new cell faulty?

The fuel gauge IC is recalibrating its coulomb counter against the new BLP875 discharge curve, and the readings are unreliable until that process completes. This is a software calibration state, not a cell defect. Discharge the phone normally until it shuts itself down, then charge it in one continuous session to 100% without unplugging. After that single full cycle the counter anchors to the new curve and percentage reporting stabilises.

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