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Redmi 5 Plus BN44 Compatible Battery 3.85V 3900mAh

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Fits Redmi 5 Plus models MEG7 and MEE7, replaces OEM part BN44.
3.85V at 3900mAh Li-Polymer chemistry restores full charge capacity on degraded cells.
Connector seats flush into the vertical slot with no locking tab interference.
We ran five full discharge cycles on a MEG7 test unit — BMS voltage regulation stayed steady, no early cutoff.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against this cell's discharge curve.
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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.

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🔹 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

3.85V

Amp

3900mAh

Redmi 5 Plus — 3.85V Li-Polymer Replacement Battery (BN44)

This is a 3900mAh Li-Polymer battery for the Redmi 5 Plus smartphone. It replaces OEM part BN44 and fits the MEG7 and MEE7 variants, including the Dual SIM models. Voltage is 3.85V, with a total energy rating of 15.02Wh.

  • 5 Plus variant coverage: The MEG7, MEE7, and Dual SIM builds share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell fits all listed variants without hardware modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 5 Plus unit. The BMS accepted the cell without fault codes, and the charge IC ramped current correctly through CC and CV phases.
  • First-cycle fuel gauge recalibration: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Why the Redmi 5 Plus reports wrong battery percentage after a cell swap

The fuel gauge IC stores a discharge model based on the old cell's internal resistance and capacity curve. When a new cell goes in, the IC is still reading against stale calibration data. The percentage shown can lag or jump by 5–15% until the IC re-learns the new curve. One full discharge to shutdown followed by a complete charge cycle forces the coulomb counter to reset against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff symptom. Under modem or display load, the uncalibrated cell voltage drops sharply below the threshold the OS expects at that reported percentage. The BMS interprets this as a low-voltage fault and cuts power before the fuel gauge catches up. The fix is the same full recalibration cycle — run the phone down to automatic shutdown, then charge uninterrupted to 100% without fast charging enabled. After one clean cycle, the coulomb counter anchors both endpoints and the cliff disappears.

Compatible Models

5 Plus MEG7 MEE7 5 Plus Dual SIM 5 Plus Dual SIM TD-LTE Vince Note 5 Dual SIM Note 5 Dual SIM TD-LTE

Replaces Part Numbers

BN44

Technical Specifications

Voltage3.85V
Amp Hours3900mAh
Capacity3900mAh
Rate15.02Wh
Net Weight53.5g /1.89 oz
Gross Weight89g /3.14 oz
Approximate Weight89g /3.14 oz
Dimension 85.45 x 64.00 x 3.90mm

Product Highlights

  • Brand: Redmi
  • 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 Redmi 5 Plus won't turn on at all after the new BN44 battery sat in a drawer for a few months — is the cell dead?

It is not necessarily dead. Li-Polymer cells in storage self-discharge slowly, and if the cell dropped below roughly 2.5V the BMS enters a lockout state to prevent damage. Plug the phone into a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing the power button. The charge IC needs to trickle current into the cell until it climbs above 3.0V before the BMS will release and allow a normal boot.

Fast charging stopped working on the Redmi 5 Plus right after I fitted the replacement battery — it only charges slowly now.

This is normal on the first cycle with a new cell. The phone's charge controller re-negotiates the charging protocol on each new BMS handshake, and on the first cycle it defaults to a conservative current limit until it confirms the cell can handle higher rates. Run one full standard-rate charge to 100%, then let the phone discharge to around 10% before charging again. On the second cycle the proprietary fast-charge protocol should re-engage and the charge IC will step up to its normal current profile.

The battery percentage on my Redmi 5 Plus keeps jumping around erratically — 60% one minute, 48% the next.

The fuel gauge IC is recalibrating against the new cell's discharge curve and the coulomb counter has not yet anchored its endpoints. This typically happens in the first two or three charge cycles after a cell replacement. Do not top up the phone repeatedly in short bursts — that prevents the IC from seeing a full discharge profile. Let the phone run down to automatic shutdown once, then charge in a single uninterrupted session to 100%, and the percentage readout should stabilise.

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