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Thunderobot SQU-1406 911M-M1A Compatible Battery 14.4V 5100mAh

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From $93.99 USD $115.99
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Fits Thunderobot 911M-M1A and 43 related models using OEM part SQU-1406 battery connector.
14.4V, 5100mAh capacity delivers full system power to CPU and display under load.
Connector slides into the factory slot with a single locking tab — no adapters needed.
Bench testing showed the BMS accepted charge within spec and held voltage steady under sustained draw.
After installation, fully discharge to system shutdown, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after cell replacement.
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

14.4V

Amp

5100mAh

Thunderobot 911M-M1A Series — 14.4V Li-ion Replacement Battery (SQU-1406)

This is a 14.4V Li-ion replacement battery rated at 5100mAh (73.44Wh) for the Thunderobot 911M-M1A and related 911 series gaming laptops. It uses OEM part number SQU-1406 and fits multiple variants including the 911M-M5, 911M-M3, and 911-S2e. Install it when the original cell no longer holds usable charge under gaming loads.

  • 911 series cell compatibility: The 911M-M1A, M3, M5, and S2e variants all share the same 14.4V battery rail, connector pinout, and BMS handshake protocol — that is why a single SQU-1406 cell covers the full range without any adapter or firmware workaround.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a 911 series unit, confirmed BMS communication at all charge states, and verified the protection circuit triggers correctly at low-voltage cutoff without false trips during high-CPU draw spikes.
  • Post-install calibration cycle: After fitting this cell, run the laptop on battery until it drops to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the system flags after any cell swap.

Why the 911M-M1A shuts down at 20–30% during heavy gaming sessions

Under simultaneous CPU and GPU load, the 911 series draws peak current that exposes a voltage cliff in aged or uncalibrated cells. The battery voltage collapses faster than the fuel gauge IC can track, so the displayed percentage is still 20–30% when the cell actually hits the BMS low-voltage cutoff. This is not a hardware fault with the replacement cell — it is a calibration gap between the new cell's discharge curve and the stored EEPROM data from the previous cell. Running one full discharge-to-hibernate cycle resolves this in most cases.

BIOS reporting battery as "Unknown" or 0% immediately after fitting the SQU-1406

The BIOS reads battery identity and health data from the cell's EEPROM, not from live voltage alone. When a new cell is installed, the EEPROM data does not match the charge history the system was tracking, so the BIOS flags it as unknown or reports 0%. This is expected behaviour on Thunderobot 911 series firmware. Boot into the OS, plug in AC power, and allow a full charge cycle to complete — the BIOS will re-register the cell and display correct health data. If the warning persists after one full charge, run the hibernate-cutoff discharge cycle described above to force a complete learn cycle reset.

Compatible Models

911M-M1A 911M-M5 911M-M3 911-S2e 911-T3 911M-M3A JT009200S 911-E1d 911-S2A 911-S2C 911M-M1C 911GT-Y2 911-T2C 911-S3 911-T1B 911-T1c 911M-M4 911-S2g 911-S5TA 911M-M2A 911M-M2b 911M-M2 911-E1c 911-T1a 911M-M5A 911M-47208G1T9602G 911-S2K 911GT-Y3 911-S2D 911-S1g 911GT-Y1 911-E1B 911GT-Y3A 911-S5A 911M-M1 911-E1A 911-S1 911-S2b 911-T2a 911-S2 911-T1 911-T2 911-E1 911M 911GT 911-M 911 Turbo

Replaces Part Numbers

SQU-1406

Technical Specifications

Voltage14.4V
Amp Hours5100mAh
Capacity5100mAh
Rate73.44Wh
Net Weight449.4g /15.85 oz
Gross Weight719.4g /25.38 oz
Approximate Weight719.4g /25.38 oz
Dimension 330.00 x 108.90 x 18.80mm

Product Highlights

  • Brand: Thunderobot
  • 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

My Thunderobot 911M-M1A shows the new SQU-1406 battery as "poor health" in the BIOS right after installation — is the cell faulty?

The cell is not faulty. The BIOS reads health data from the EEPROM stored on the previous cell, and the new cell's EEPROM does not match that history, triggering the warning. Run a full charge to 100% on AC, then discharge on battery to hibernate cutoff, then charge uninterrupted back to 100%. That single learn cycle rewrites the BIOS health data against the new cell and clears the warning.

The fuel gauge on my 911M is jumping from 60% down to 15% in minutes — what is happening?

The fuel gauge IC inside the laptop calibrates itself against discharge data it accumulated from the old cell. With a new cell installed, the stored curve no longer matches the actual chemistry, so the gauge miscounts consumed capacity and produces wild jumps. We saw the same behaviour on the bench during the first two cycles. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100% and the gauge IC will recalibrate against the new cell's actual discharge curve.

The system info panel is showing 68Wh for this battery but the spec says 73.44Wh — why is there a discrepancy?

The Wh figure shown in Windows or the BIOS is read from the cell's EEPROM rated value, which can differ slightly from the actual measured capacity of the installed chemistry. The SQU-1406 cell we supply is rated at 73.44Wh at the cell level, but EEPROM-reported values often reflect a conservative factory figure written at manufacture. This is a data reporting difference, not a capacity loss. To confirm actual capacity, run a full discharge cycle and check the mWh count logged by a tool like HWiNFO64 against the 73,440mWh rated value.

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