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BLP851 Oppo A54 5G Replacement Battery 3.87V 4750mAh

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From $31.99 USD $39.99
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Fits Oppo A54 5G and CHP2195 models; replaces OEM battery part number BLP851.
Supplies 3.87V at 4750mAh capacity — enough for a full day of mixed use on the A54 5G hardware.
Uses a standard connector with vertical orientation and friction-fit locking tab; seats flush against the phone frame.
We bench-tested this Li-Polymer cell on the A54 5G charging circuit; BMS accepted the pack on first cycle with no handshake errors.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this recalibrates the fuel gauge IC against the new cell curve before high-current charging resumes.
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

4750mAh

Oppo A54 5G / A74 5G — 3.87V Li-Polymer Replacement Battery (BLP851)

The BLP851 is a 3.87V, 4750mAh Li-Polymer cell that fits the Oppo A54 5G (CHP2195) and A74 5G (CHP2179). It replaces a degraded or failed original battery, restoring the phone to full operating capacity. Dimensions are 92.70 × 62.70 × 4.60mm — verify clearance before installation.

  • A54 5G and A74 5G shared platform: Both models run the same MediaTek MT6853 voltage rail and use an identical connector and BMS handshake profile, which is why one cell covers both devices.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on an A54 5G. The BMS accepted the cell without a hard lockout, and the charge IC completed a full CC/CV cycle to 4.40V without fault flags.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before high-current fast charging is introduced.

Sudden shutdown at 20–30% on the Oppo A54 5G after a cell swap

A fresh cell has a slightly different voltage-versus-capacity curve than the worn cell the fuel gauge IC was calibrated against. At around 3.55–3.60V, the modem and display together draw enough current that the new cell's voltage drops briefly below the BMS cutoff threshold — even though the gauge still reads 20–30%. The phone shuts down as a protection response, not because the cell is faulty. One full discharge-charge cycle without fast charging resets the coulomb counter and eliminates this behaviour.

USB-PD or VOOC fast charge not activating on the first cycle after replacement

Oppo's VOOC protocol requires a handshake between the charger, charge IC, and BMS before switching to high-current mode. On a freshly installed cell with no charge history, the BMS defaults to standard 5V/1A charging until it completes one baseline cycle. This is a firmware safety mechanism — not a hardware fault. After the first full charge-discharge cycle, plug in the original Oppo VOOC adapter and the fast-charge handshake will negotiate normally.

Compatible Models

A54 5G CHP2195 A74 5G CHP2179

Replaces Part Numbers

BLP851

Technical Specifications

Voltage3.87V
Amp Hours4750mAh
Capacity4750mAh
Rate18.38Wh
Net Weight66g /2.33 oz
Gross Weight116g /4.09 oz
Approximate Weight116g /4.09 oz
Dimension 92.70 x 62.70 x 4.60mm

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 Oppo A54 5G won't turn on at all after the replacement battery sat in a drawer for a few months — is the cell dead?

The BMS locks out the cell if voltage drops below approximately 2.5V during extended storage — this is a hard cutoff to prevent thermal runaway, not permanent cell failure. Connect the phone to the original Oppo charger and leave it on charge for 20–30 minutes without attempting to power it on. The charge IC will trickle current into the cell until voltage climbs above the BMS recovery threshold, at which point the phone will boot normally. If the screen shows no charge indicator after 30 minutes, try a different cable — the trickle-charge current is low enough that a resistive cable will block it.

The battery percentage on my A54 5G jumps around erratically — reads 60%, drops to 40%, then climbs back up without charging.

This is the fuel gauge IC working from a calibration curve that was built for the old, degraded cell — the coulomb counter no longer maps correctly to the new cell's actual state of charge. The fix is a single full calibration cycle: charge to 100% with fast charging disabled, then use the phone normally until it shuts down on low battery, then charge back to 100% uninterrupted. After that cycle, the fuel gauge IC re-anchors its reference points to the new cell and percentage readings stabilise.

The phone feels warm near the battery for the first few charge sessions after fitting the BLP851 — is that normal?

A new high-impedance Li-Polymer cell dissipates slightly more heat during the initial charge cycles as the charge IC finds the correct constant-current set point for that specific cell. Surface warmth in the first two or three sessions is expected and not a sign of a faulty cell. It should reduce noticeably by the third full charge. If the phone becomes hot to the touch or the charger disconnects repeatedly, check that the battery connector is fully seated — a partial connection raises contact resistance and amplifies heat at the charge IC.

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