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Meizu BA712 M6s Replacement Battery 3.85V 2900mAh

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From $24.99 USD $30.99
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Fits MeiZu M6s and M6s Premium Edition smartphones; replaces OEM part number BA712.
3.85V and 2900mAh capacity restores full charge cycles on the M6s after battery degradation or sudden shutdowns.
Connector seats into the internal battery slot with a single locking tab; orientation is keyed to prevent reverse insertion.
We ran a full discharge cycle on the bench — the BMS held voltage stable under load and cut off cleanly at the 2.5V floor.
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 before high-current 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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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.

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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

2900mAh

MeiZu M6s — 3.85V Li-Polymer Replacement Battery (BA712)

This is a 3.85V, 2900mAh Li-Polymer replacement cell for the MeiZu M6s smartphone. It fits the M6s, M6s Premium Edition, M6s Premium Edition Dual SIM TD-LTE, and M712Q-B, among other variants that share the BA712 specification. Swap it in when the original cell no longer holds a usable charge across a full day of normal use.

  • M6s variant compatibility: All listed M6s models share the same battery bay dimensions, connector pinout, and BMS handshake. The BA712 part number spans the standard and Premium Edition lines because Meizu used a single battery platform across this range without altering the protection circuit or cell footprint.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the M6s platform and confirmed the BMS communicates correctly with the charge IC — no false full-charge flags, no premature cutoff at the low end of the discharge curve.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve map against the new cell before high-current charging pushes into an uncalibrated state.

Why the M6s reports wrong battery percentage after a cell swap

The M6s uses a coulomb counter inside the fuel gauge IC to track charge state. When you install a new cell, the IC still holds the old cell's discharge curve in memory. It reads the new cell's voltage and maps it to the wrong capacity point, which is why the percentage displayed is off — sometimes by 15–20 percent. One full discharge to auto-shutoff followed by a complete charge to 100 percent forces the IC to relearn the curve against the actual cell chemistry. After that cycle, percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC hasn't yet calibrated to the new cell's voltage-to-capacity curve. The cell voltage drops sharply under modem or display load at a point the IC still thinks is safe, and the BMS trips before the displayed percentage reaches zero. It is not a faulty cell — it is a calibration gap. Run one complete discharge cycle without fast charging, let the phone shut off naturally, then charge uninterrupted to 100 percent. After that cycle, the cutoff threshold aligns correctly and the phone no longer drops out above 3.6V under load.

Compatible Models

M6s M6s Premium Edition M6s Premium Edition Dual SIM TD-LTE M712Q-B M712M M712c M712Q Meilan S6

Replaces Part Numbers

BA712

Technical Specifications

Voltage3.85V
Amp Hours2900mAh
Capacity2900mAh
Rate11.17Wh
Net Weight41.2g /1.45 oz
Gross Weight66g /2.33 oz
Approximate Weight66g /2.33 oz
Dimension 72.33 x 61.90 x 3.85mm

Product Highlights

  • Brand: MeiZu
  • 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 MeiZu M6s won't turn on at all after the replacement battery sat in a drawer for months — is the cell dead?

The BA712 cell's BMS locks out below approximately 2.5V per cell to prevent damage from deep discharge. A phone that won't power on after storage is almost always in BMS lockout, not a failed cell. Connect it to a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle current into the cell until voltage climbs above the BMS recovery threshold, at which point the phone will boot normally.

Fast charging stopped working on the M6s after I installed the new battery — it only charges slowly now.

On the first charge cycle after a cell swap, the M6s charge IC may not negotiate the proprietary fast-charge protocol with the new BMS until it has completed one standard charge. This is a handshake timing issue, not a hardware fault. Complete one full slow charge to 100 percent, then disconnect and reconnect the charger — the fast-charge protocol should re-establish on the next session. If it does not, check that the charger output is at least 9V 1.5A, which is the minimum the M6s requires to enter fast-charge mode.

The battery percentage on my M6s is jumping around erratically — it reads 45%, then drops to 12%, then jumps back up.

Erratic percentage jumps after a cell replacement mean the fuel gauge IC is recalibrating against a discharge curve it does not recognise yet. The old cell's data is still in the IC's memory, and voltage readings from the new cell don't match the stored map. Let the phone discharge to auto-shutoff without interruption, then charge in one continuous session to 100 percent without unplugging mid-cycle. That single full cycle gives the coulomb counter enough data to remap accurately, and percentage readings stabilise from that point.

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