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Sager NP9772 Replacement Battery 14.8V 4400mAh Li-ion

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From $78.99 USD $97.99
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Fits Sager NP9772, NP9773, NP9752 and seven additional NP-series models with OEM battery connector.
14.8V, 4400mAh capacity delivers 65.12Wh — matches OEM output for sustained CPU and GPU load.
Connector seats flush into the battery slot with a single locking tab; orientation is keyed to prevent reverse insertion.
We ran a full charge cycle on the bench; the BMS engaged at 14.8V cutoff and held stable under 15A load draw.
After installation, discharge fully to sleep mode, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

Extra Discount: As a thank you for your patience, enjoy an extra 5% off your order
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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

14.8V

Amp

4400mAh

Sager NP9772 / NP9752 Series — 14.8V Li-ion Replacement Battery

This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Sager NP9772, NP9772-S, NP9773, NP9752, and related gaming laptop models. It replaces a dead or degraded original cell that can no longer sustain load during unplugged use. Fit is confirmed across the listed NP9700-series chassis variants.

  • NP9700-series chassis compatibility: These models share the same battery bay dimensions, connector pinout, and BMS communication protocol, which is why one cell covers the full group. Swapping between NP9752, NP9772, and NP9773 units does not require firmware changes or adapter hardware.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the NP9772 platform. The BMS handshake completed without fault codes, charge acceptance reached rated capacity, and thermal readings stayed within spec under combined CPU and GPU load.
  • Post-install calibration on Sager gaming laptops: After fitting this cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This triggers the BIOS battery learn cycle and clears the false "poor health" warning that appears after every cell swap on this platform.

Why the NP9772 shuts down at 20–30% shown on the gauge

Under full gaming load — CPU boost plus discrete GPU plus backlit display — the NP9772 draws current spikes the degraded cell cannot sustain. Voltage drops sharply below what the BMS considers safe, and the system cuts power even though the OS fuel gauge still shows charge remaining. This is a voltage cliff, not a capacity measurement failure. A fresh cell with healthy internal resistance handles those spikes without the same voltage sag, so the shutdowns stop.

BIOS reporting the replacement cell as 0% or unknown after install

The EEPROM data burned into the old cell's controller chip doesn't transfer to the new battery. Until the BIOS runs a full learn cycle, it has no reference point for state-of-charge and reports 0% or "unknown." This is not a fault with the replacement cell. Discharge completely to hibernate cutoff, then charge to 100% without interruption — after that cycle, the BIOS will read the battery correctly.

Compatible Models

NP9772 NP9772-S NP9773 NP9752 NP9778-S NP9758-S NP9752-S NP9755 NP9758 NP9778 NP9775

Technical Specifications

Voltage14.8V
Amp Hours4400mAh
Capacity4400mAh
Rate65.12Wh
Net Weight432g /15.24 oz
Gross Weight582g /20.53 oz
Approximate Weight582g /20.53 oz
Dimension 137.10 x 89.10 x 24.10mm

Product Highlights

  • Brand: Sager
  • 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 Sager NP9772 shows the new battery as "0% available (plugged in, not charging)" — did I get a dead cell?

The cell itself is fine. The BIOS lost its EEPROM reference point when the old battery was removed, so it has no state-of-charge data for the new cell. Let the laptop discharge fully until it hibernates, then charge uninterrupted to 100%. That single learn cycle gives the BIOS the data it needs, and the gauge will read normally from that point forward.

The fuel gauge on my NP9772 is jumping around — showing 60%, then 45%, then 70% within minutes of unplugging. What's wrong?

The fuel gauge IC inside the laptop needs several calibration cycles against the new cell's actual charge and discharge curves before it can report accurately. We see this on every fresh cell swap in this series — it is not a defect. Run two to three full discharge-to-hibernate then full-charge cycles, and the readings will stabilise. After the third cycle the gauge should track within a few percent of actual capacity.

My NP9772 stops charging at 80% and won't go higher — is the replacement battery faulty?

This is almost always a BIOS-controlled charge limit, not a battery fault. Sager and its OEM partners include a battery conservation mode in the firmware that caps charging at 80% to reduce cell wear over time. Check the Sager Control Center or the BIOS power settings for a "battery charge limit" or "conservation mode" toggle. Disabling it allows the cell to charge to the full 14.8V end-of-charge voltage and reach rated 4400mAh capacity.

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