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BLP915 Oppo A57 5G Replacement Battery 3.87V 4900mAh

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New arrival
From $30.99 USD $38.99
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Fits Oppo A57 5G, A57 5G 2022, and PFTM20 — replaces OEM BLP915 battery.
Delivers 3.87V and 4900mAh capacity for sustained power to processor, modem, and display throughout normal daily use.
Connector seats flush into the phone's battery slot with standard Li-Polymer contact alignment and mechanical locking tabs.
We ran full discharge cycles on the bench — the BMS accepted charging protocol on first insertion and held voltage stability under load.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell curve before high-current fast 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.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

Disclaimer

⚠️ 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

4900mAh

Oppo A57 5G — 3.87V Li-Polymer Replacement Battery (BLP915)

The BLP915 is a 3.87V, 4900mAh Li-Polymer cell that fits the Oppo A57 5G, A57 5G 2022, and PFTM20 variants. It replaces the original battery when capacity has dropped or the cell no longer holds a charge. Rated at 18.96Wh, it restores power to the display, processor, and 5G modem stack.

  • A57 5G, A57 5G 2022, and PFTM20 fitment: All three share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers the full platform without modification.
  • Bench tested on actual hardware: We cycled the BLP915 through charge and discharge on a live A57 5G unit. The BMS accepted the cell without error flags, and the charge IC stepped through trickle, CC, and CV phases correctly.
  • Fuel gauge recalibration on first use: After fitting this cell, disable fast charging for one full discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current fast charging begins pushing current into an uncalibrated register.

Sudden shutdown at 20–30% after replacing the BLP915

A fresh Li-Polymer cell has a steeper voltage curve near the bottom of its charge window than an aged cell. The A57 5G's fuel gauge IC is still running the old cell's calibration table, so it misreads remaining capacity. When the 5G modem or display pulls a current spike, the cell voltage drops below the BMS cutoff threshold before the OS has registered low battery — the phone shuts off without warning. Run one complete discharge to near shutdown, then a full uninterrupted charge to 100%. After that cycle the coulomb counter recalibrates and the early shutdowns stop.

USB-PD or VOOC fast charge not triggering on the first cycle

Oppo's proprietary fast charge protocol requires a BMS handshake before the adapter steps up current. On a new, unconditioned cell, the BMS may respond conservatively and keep the charge path in standard 5V mode for the first cycle. This is normal behaviour — the BMS is not defective. Plug in using the original Oppo cable and adapter, let the first charge complete fully without interruption, and fast charging will activate from the second cycle onward once the BMS registers a full initialisation event.

Compatible Models

A57 5G A57 5G 2022 PFTM20

Replaces Part Numbers

BLP915

Technical Specifications

Voltage3.87V
Amp Hours4900mAh
Capacity4900mAh
Rate18.96Wh
Net Weight65.5g /2.31 oz
Gross Weight115.5g /4.07 oz
Approximate Weight115.5g /4.07 oz
Dimension 92.60 x 64.20 x 4.40mm

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 A57 5G shuts off at around 25% after I put in the new BLP915 — is the battery faulty?

The battery is not faulty. The fuel gauge IC in the A57 5G is still reading the discharge curve of your old, degraded cell, so it reports incorrect capacity on the new one. Under a modem or display load spike, the cell voltage drops below the BMS cutoff before the OS logs a low-battery warning. Run one full discharge to automatic shutdown, then charge uninterrupted to 100% — after that cycle the coulomb counter recalibrates and the premature shutdowns stop.

The battery percentage jumps around erratically — it reads 60%, then skips to 45% a few minutes later. What causes that?

Erratic percentage jumps are a fuel gauge IC recalibration issue, not a cell defect. The IC uses a stored charge-capacity table built from your previous battery's behaviour, and the new BLP915 cell has a different internal resistance profile. The gauge loses track when voltage swings don't match its expected curve. Complete two full discharge-charge cycles without interruption and the IC will rewrite its reference table to match the new cell — the jumping stops once it has enough data points.

The phone won't turn on at all after the replacement battery sat uninstalled for a few weeks. Nothing happens when I press power.

Li-Polymer cells self-discharge in storage, and if the BLP915 dropped below roughly 2.5V while sitting uninstalled, the BMS has entered lockout mode to prevent damage to the cell. Connect the original Oppo charger and leave it plugged in for at least 20–30 minutes without pressing the power button — the charge IC will trickle current into the cell until voltage climbs above the BMS recovery threshold. Once voltage reaches approximately 3.0V, the BMS resets and the phone will power on normally.

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