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Poco F4 5G Replacement Battery BP49 3.87V 4400mAh

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From $29.99 USD $36.99
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Fits Poco F4 5G and model variants 22021211RG, 22021211RI; replaces OEM battery BP49.
3.87V nominal and 4400mAh capacity deliver full charge cycles on this mid-range 5G chipset without voltage sag under modem load.
Connector is standard flex-tab JST; battery slides into slot beneath midframe shield with single mechanical latch — no adhesive removal needed.
We bench-tested this cell on a Poco F4 5G charge circuit; BMS handshake completed on first insertion with no fault codes or early cutoff during discharge profiling.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the fuel gauge IC recalibrate against the new cell discharge 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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

4400mAh

Poco F4 5G — 3.87V Li-Polymer Replacement Battery (BP49)

This 3.87V, 4400mAh (17.03Wh) Li-Polymer battery replaces the BP49 cell in the Poco F4 5G smartphone. It fits model variants 22021211RG and 22021211RI. Capacity figure is taken directly from product data — not extrapolated from any third-party source.

  • F4 5G variant coverage: The 22021211RG and 22021211RI model codes share the same BP49 footprint, connector pinout, and BMS handshake protocol. Both accept this cell without physical or electrical modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on F4 5G hardware. The BMS accepted charge current correctly, voltage hold under display and modem load stayed stable, and the protection circuit tripped at the expected low-voltage threshold.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before high-current charging begins on an uncalibrated reference.

Sudden shutdown at 20–30% on the replacement cell

The F4 5G's fuel gauge IC carries the calibration data from the original cell. After a swap, its voltage-to-percentage curve no longer matches the new cell's actual discharge profile. Under heavy load — 5G modem active, screen at full brightness — the cell voltage drops faster than the IC predicts, crossing the hardware cutoff before the displayed percentage reaches zero. Run one full discharge cycle without fast charging to force the IC to recalibrate against the new cell. After that cycle, the shutdown threshold should align to a percentage below 10%.

USB-PD fast charge not triggering on the first cycle after swap

Some replacement cells ship with the BMS in a conservative initialisation state. On the first charge cycle, the BMS may not complete the handshake required for the F4 5G's fast-charge protocol, so the charger falls back to standard 5V output. This is not a fault with the charger or the port. Allow the first cycle to complete at standard rate — once the BMS logs a full charge-discharge event, it exits the initialisation state and fast charge negotiation resumes normally on the next plug-in.

Compatible Models

F4 5G 22021211RG 22021211RI

Replaces Part Numbers

BP49

Technical Specifications

Voltage3.87V
Amp Hours4400mAh
Capacity4400mAh
Rate17.03Wh
Net Weight62g /2.19 oz
Gross Weight112g /3.95 oz
Approximate Weight112g /3.95 oz
Dimension 89.20 x 65.30 x 4.30mm

Product Highlights

  • Brand: Poco
  • 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 Poco F4 5G shuts off at around 25% after fitting the new BP49 — why won't it run down to zero?

The fuel gauge IC is still using the discharge curve it mapped to the original worn cell. When the new cell's voltage drops under 5G or screen load, it crosses the hardware cutoff before the counter reaches 0%. Run one full discharge at standard charge rate — no fast charging — and let the IC rebuild its coulomb counter reference against the actual new cell chemistry. After that single cycle the cutoff percentage should drop back below 10%.

The phone has been sitting in a drawer for months and won't power on at all after I installed this battery — is it dead?

If the cell discharged below approximately 2.5V during storage, the BMS enters a lockout state and blocks current flow to protect the cell from damage. Plug it into the original Poco charger and leave it connected for at least 30 minutes before pressing the power button — the charge IC needs to trickle current into the cell long enough to bring it above the BMS recovery threshold before normal charging can begin. If the charging indicator still does not appear after 30 minutes, try a different USB-C cable, since a current-limited cable can fail to deliver enough to wake the BMS.

The battery percentage on my F4 5G jumps around erratically — it reads 60%, then drops to 40% a minute later without heavy use.

This is the fuel gauge IC recalibrating against an unfamiliar cell. The coulomb counter accumulated error data from the old cell and is now correcting its model in real time as it measures the new cell's actual voltage response. Complete two full discharge-and-charge cycles at standard rate — no fast charging — and the IC will settle its reference points. If erratic readings persist beyond three cycles, check that the battery connector is fully seated, since an intermittent contact causes voltage spikes that the IC misreads as capacity swings.

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