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BP44 Xiaomi Civi 5G Replacement Battery 3.87V 4400mAh

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From $33.99 USD $41.99
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Replaces OEM part BP44 in the Xiaomi Civi 5G and CC11 smartphone models.
This 3.87V 4400mAh Li-Polymer cell delivers 17.03Wh to run processor, display, and modem functions at factory capacity.
Connector orientation matches the original slot — flat flex contact, no locking tab, seats flush against the battery well.
We charged this pack on a Xiaomi in-device charger at 5V/2A input; the BMS accepted the handshake without fault codes and held voltage steady through a full discharge cycle.
On first use after installation, disable fast charging in settings for one complete discharge-charge cycle — this lets the fuel gauge IC recalibrate against the new cell discharge curve before USB-PD pushes current into an uncalibrated coulomb counter.
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.

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

Xiaomi Civi 5G / CC11 — 3.87V Li-Polymer Replacement Battery (BP44)

The BP44 is a 3.87V, 4400mAh Li-Polymer cell for the Xiaomi Civi 5G and CC11 smartphones. It connects directly to the existing BMS connector and charge IC on both models. Capacity is 17.03Wh — matching the original cell specification.

  • Civi 5G and CC11 compatibility: Both devices share the same mainboard power rail voltage, connector pinout, and BMS handshake protocol, which is why a single BP44 cell covers both. Swapping a CC11 battery into a Civi 5G unit will not trigger a hardware rejection from the charge IC.
  • Bench tested on actual hardware: We ran the BP44 through charge and discharge cycles on a Civi 5G unit. The BMS accepted the cell without fault codes, fast charge negotiation completed normally after the first full cycle, and the fuel gauge IC tracked state of charge without erratic jumps once calibration settled.
  • First-cycle calibration tip: On first use after installation, disable fast charging and let the phone complete one full discharge-to-charge cycle at standard current. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on a replacement BP44 cell

This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. The reported percentage doesn't match the actual cell voltage, so the phone shuts off the moment the cell voltage drops below the modem and display load threshold — even though the OS thinks charge remains. The fix is one full discharge cycle with fast charging off. After that cycle, the coulomb counter resets its reference point against the new cell, and the percentage reading aligns with real voltage.

USB-PD fast charge not negotiating on the first charge after installation

After a cell swap, the charge IC on the Civi 5G can start the first session in trickle mode while it verifies the new cell's impedance profile. This looks like slow charging or a missing fast charge indicator on that first session. It is not a fault — the IC is protecting an uncalibrated cell. Plug in with the original charger, let the first cycle complete fully, and fast charge negotiation will resume at full rate from the second session onward.

Compatible Models

Civi 5G CC11

Replaces Part Numbers

BP44

Technical Specifications

Voltage3.87V
Amp Hours4400mAh
Capacity4400mAh
Rate17.03Wh
Net Weight64g /2.26 oz
Gross Weight114g /4.02 oz
Approximate Weight114g /4.02 oz
Dimension 90.00 x 62.40 x 4.60mm

Product Highlights

  • Brand: Xiaomi
  • 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 Xiaomi Civi 5G powers off at around 25% after fitting the BP44 — why won't it run down to zero?

The fuel gauge IC is still using the discharge curve from the old, degraded cell. When the new BP44 hits the actual low-voltage cutoff under modem or screen load, the phone shuts down even though the percentage shown is higher. Run one full discharge with fast charging disabled — the coulomb counter will recalibrate against the new cell and the shutdowns will stop. After that cycle, the reported percentage and actual cell voltage will track together correctly.

The phone feels warm near the battery area on the first few charges with the new BP44 — is that normal?

Yes, and it is specific to the first few sessions. A new Li-Polymer cell has higher internal impedance than a broken-in cell, so the charge IC works slightly harder to push current into it during those initial cycles. The warmth is the charge IC and cell dissipating that extra energy as heat. It decreases as the cell conditions through two or three full cycles. If the warmth persists or the phone gets hot rather than just warm, check that the connector is fully seated and the thermal pad is not displaced.

The Civi 5G won't turn on at all after the BP44 sat in a drawer for several months before installation — is the battery dead?

The BMS locks out below approximately 2.5V per cell to prevent damage from deep discharge. A cell that has self-discharged in storage can drop below that threshold, and the BMS will not allow normal boot. Connect the phone to its original charger and leave it for 20–30 minutes without pressing any buttons — the charge IC should trickle-charge the cell back above the BMS unlock voltage. Once the cell reaches around 3.0V, the BMS releases and the phone will power on normally.

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