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Leagoo M8 Replacement Battery BT-572P 3.8V 2000mAh

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Fits Leagoo M8 and M5 Max smartphones; replaces OEM part number BT-572P.
Outputs 3.8V at 2000mAh capacity — enough amperage for calls, messaging, and app use on this form factor without throttling the modem under load.
Connector slides into the M8's battery slot with a single plastic locking tab; orientation marked on the cell body matches the phone's contact layout.
We charged this cell in a Leagoo dock and monitored BMS handshake — fuel gauge IC accepted the new discharge curve after one full cycle without false low-battery shutdowns.
On first use after installation, run one complete discharge-charge cycle without activating fast charging to let the fuel gauge IC recalibrate against this cell's 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.

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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

3.8V

Amp

2000mAh

Leagoo M8 / M5 Max — 3.8V Li-ion Replacement Battery (BT-572P)

This is a 3.8V, 2000mAh Li-ion replacement battery for the Leagoo M8 and M5 Max smartphones. It carries OEM part number BT-572P and fits both models due to shared cell dimensions of 82.50 × 69.10 × 4.75mm and the same voltage rail. Capacity is rated at 7.6Wh.

  • M8 and M5 Max cross-compatibility: Both phones use the same physical cell format, voltage rail, and BMS connector pinout. The BT-572P fits either model without modification. Verify the part number on your existing cell before ordering if you are unsure which model you have.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the M8 platform. The BMS handshake completed on the first cycle, the charge IC accepted current without interruption, and voltage held stable under simultaneous screen and modem load.
  • Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle before normal use. This lets the fuel gauge IC map the new cell's discharge curve. Without this step, the coulomb counter remains calibrated to the old cell and will report inaccurate percentages.

Why the M8 reports wrong battery percentage after a cell swap

The M8 uses a fuel gauge IC that builds its percentage model from the discharge curve of whichever cell is installed. When you fit a new cell, the IC still holds calibration data from the degraded original. Until you complete a full discharge and charge cycle, the reported percentage can read 10–20% higher or lower than actual state of charge. One uninterrupted cycle from 100% down to automatic shutdown and back to 100% resets the coulomb counter against the new cell's actual curve.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem's minimum voltage threshold under peak load, even though the fuel gauge still shows charge remaining. A fresh cell on an uncalibrated fuel gauge IC is the most common cause — the counter does not yet know where the real voltage cliff sits on this cell's curve. Run the recalibration cycle described above first. If shutdowns continue after one full cycle, check that the battery connector is fully seated, as a high-resistance contact causes the same voltage sag under load.

Compatible Models

M8 M5 Max

Replaces Part Numbers

BT-572P

Technical Specifications

Voltage3.8V
Amp Hours2000mAh
Capacity2000mAh
Rate7.6Wh
Net Weight49g /1.73 oz
Gross Weight84g /2.96 oz
Approximate Weight84g /2.96 oz
Dimension 82.50 x 69.10 x 4.75mm

Product Highlights

  • Brand: Leagoo
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The phone won't turn on at all after the replacement battery sat in a drawer for a few months — is it dead?

Most likely the cell discharged below 2.5V in storage and the BMS has locked out to prevent damage. Plug the phone into a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. The charge IC needs to trickle current into the cell before the BMS will re-initialise and allow a normal boot. If the charging indicator appears and then the phone boots, the cell has recovered; if there is no response at all after 45 minutes on a wall adapter, the cell has gone below the recovery threshold.

Fast charging stopped working the first time I plugged in after fitting this battery — is the charger broken?

The charger is most likely fine. On the first cycle after a cell swap, the BMS on the new cell has not yet negotiated a handshake with the phone's charge IC, so the IC defaults to standard 5V charging as a safety fallback. Charge fully on that first cycle and disconnect. On the second charge, the fast-charge protocol should reinitiate normally. If fast charging still does not activate after two full cycles, test with the original charger and cable — a worn cable with high resistance will prevent the voltage handshake from completing.

The battery percentage jumps around erratically — goes from 60% to 45% in a few minutes, then back up — what's happening?

That is the fuel gauge IC recalibrating in real time against a cell curve it does not yet recognise. The coulomb counter is estimating state of charge from voltage readings, and a new cell has a different impedance profile than the degraded original it replaced. Complete one full uninterrupted discharge cycle — let the phone run down to automatic shutdown, then charge to 100% without interruption. After that cycle the IC locks onto the new curve and percentage reporting stabilises. Do not charge in short bursts during this first cycle, as partial charges reset the counter mid-calibration.

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