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Xiaomi Mi Play BM3H Replacement Battery 3.85V 3000mAh

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From $26.99 USD $33.99
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Fits Xiaomi Mi Play model M1901F9E and M1901F9T, replacing OEM battery part number BM3H.
Supplies 3.85V at 3000mAh capacity — standard output for this phone's modem, display, and processor loads.
Connector is soldered directly to the board; the cell sits flat in the upper chassis slot with no mechanical locking tab.
We cycled the BM3H against a stock Mi Play fuel gauge IC and confirmed the BMS accepted full-voltage input without cutoff errors on discharge.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the coulomb counter recalibrate against the new cell discharge curve.
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

3.85V

Amp

3000mAh

Xiaomi Mi Play — 3.85V Li-Polymer Replacement Battery (BM3H)

The BM3H is a 3000mAh, 3.85V Li-Polymer cell for the Xiaomi Mi Play (M1901F9E, M1901F9T). It replaces the original battery when capacity has degraded or the cell has failed. Capacity figure is 11.55Wh at nominal voltage.

  • M1901F9E and M1901F9T compatibility: Both regional variants of the Mi Play share the same battery bay dimensions (69.84 × 60.38 × 4.00mm), connector pinout, and BM3H part number. The BMS handshake and charge IC communication lines are identical across both SKUs.
  • Bench tested on actual hardware: We cycled the BM3H through charge and discharge on Mi Play hardware and confirmed the BMS accepted charge termination correctly, with no false full-charge flags and no overcurrent trip during screen-on load testing.
  • First-cycle fast charge protocol: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging pushes into an uncalibrated state.

Why the Mi Play reports wrong battery percentage after a cell swap

The Mi Play uses a coulomb-counting fuel gauge IC that builds its model against the previous cell's charge curve. When a new cell goes in, that stored model no longer matches the actual chemistry. The gauge reads an offset until it recalibrates. One full discharge to auto-off, followed by an uninterrupted charge to 100%, resets the count and re-anchors the percentage display to the new cell.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the modem or display draws a short current spike and the cell voltage drops below the BMS cutoff threshold before the gauge registers the drop. It is not a defective cell — it is a voltage cliff the fuel gauge did not predict because it was still running the old cell's discharge model. The fix is the same recalibration cycle: drain to shutdown, charge uninterrupted to 100%, and check that the percentage tracks smoothly below 30%. If the shutdown persists past two full cycles, verify the battery connector is fully seated and check for residual voltage at the connector — it should read above 3.6V on a charged cell.

Compatible Models

Mi Play M1901F9E M1901F9T

Replaces Part Numbers

BM3H

Technical Specifications

Voltage3.85V
Amp Hours3000mAh
Capacity3000mAh
Rate11.55Wh
Net Weight41.4g /1.46 oz
Gross Weight66g /2.33 oz
Approximate Weight66g /2.33 oz
Dimension 69.84 x 60.38 x 4.00mm

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 Mi Play won't turn on at all after the replacement battery sat in a drawer for a few months — is the cell dead?

The BM3H's BMS locks out below 2.5V per cell to prevent damage from deep discharge. A cell in storage can drift below that threshold, triggering a protective cutoff that blocks normal power-on. Plug the phone into a charger and leave it for 20–30 minutes without pressing any buttons — the charge IC will trickle-feed the cell above the lockout voltage before the BMS re-initialises. Once the charge LED activates or the boot screen appears, the cell has recovered above 2.8V and can charge normally.

Fast charging stopped working after I swapped in the BM3H — the phone charges but only at standard speed now.

On the first cycle after a cell replacement, the Mi Play's charge IC may not negotiate the proprietary fast-charge protocol until the BMS has completed one full cycle and confirmed cell health. This is normal behaviour — the IC defaults to standard current as a safety measure with an uncalibrated cell. Complete one full standard-speed charge to 100%, then discharge and recharge; fast charging typically re-engages on the second cycle once the BMS signals a clean bill of health to the charge controller.

The battery percentage on my Mi Play is jumping erratically — bouncing between 45% and 60% without any pattern.

Erratic percentage jumps are a fuel gauge IC recalibration issue, not a faulty cell. The coulomb counter is interpolating against a discharge model built for the old cell and is correcting itself in real time as it takes new readings. Let the phone discharge continuously to auto-shutdown under normal use — no top-up charges mid-cycle — then charge it uninterrupted to 100% without removing the charger early. After that single complete cycle the gauge re-anchors its model to the BM3H's actual discharge curve and the percentage should track smoothly.

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