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Sager NP8955 Replacement Battery 15.2V 3550mAh

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From $80.99 USD $99.99
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Fits Sager NP8955(P955ER), NP8973(P970EN), NP8961(P960ED), and NP8977(P070RF) gaming notebooks.
15.2V, 3550mAh capacity delivers sustained power for CPU and discrete graphics under load.
Connector seats flush into the battery bay slot with a standard latch hold-down.
We cycled this pack through full discharge and recharge; the BMS held voltage stable throughout.
After installation, run one full discharge to sleep mode then charge uninterrupted to 100%—this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after cell swap.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on 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

15.2V

Amp

3550mAh

Sager NP8955(P955ER) / NP8973(P970EN) Series — 15.2V Li-Polymer Replacement Battery

This 15.2V lithium-polymer battery delivers 3550mAh (53.96Wh) of capacity for the Sager NP8955(P955ER) and related Clevo-platform gaming laptops. It fits the NP8955(P955ER), NP8973(P970EN), NP8961(P960ED), NP8977(P070RF), and twelve additional models in this Clevo chassis family. Voltage, cell count, and connector match the original pack specification.

  • Clevo P9xx platform compatibility: These models share a common Clevo OEM chassis with the same 4-cell 15.2V battery bay, connector pinout, and BMS communication protocol — which is why one cell fits across all listed variants without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a P955ER chassis. The BMS handshake completed on first boot, charge termination triggered correctly at full capacity, and the protection circuit tripped as expected under over-discharge conditions.
  • Post-swap calibration on the Clevo platform: After installing, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The Clevo BIOS reads health data stored in the battery pack's EEPROM and compares it against accumulated cycle history. A brand-new cell carries factory EEPROM values the BIOS hasn't yet validated against real charge cycles on this system. Until the learn cycle runs, the BIOS flags health as poor or unknown — this is a firmware read issue, not a defective battery. Run two full charge-discharge cycles and the BIOS health indicator will update to reflect actual cell condition.

Laptop shuts down abruptly when the OS shows 20–30% remaining

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The gauge estimates remaining charge based on the old cell's discharge profile, so it reports 25% while the real voltage has already dropped to the protection cutoff threshold. The BMS cuts power to prevent cell damage before the OS reads zero. Force a full discharge to hibernate, then a full uninterrupted charge to 100%, repeating twice — after that the fuel gauge IC recalibrates and the reported percentage tracks the actual cell voltage accurately.

Compatible Models

NP8955(P955ER) NP8973(P970EN) NP8961(P960ED) NP8977(P070RF) NP8966(P960RD) NP2950(P955ET1) NP8968(P960RN) NP8954(P955ER) NP8972(P970EF) NP8955-S(P955ER) NP8976(P970RD) NP8962(P960EF) NP8978(P970RN) NP8967(P960RF) NP2952(P955ET3) NP8971(P970ED)

Technical Specifications

Voltage15.2V
Amp Hours3550mAh
Capacity3550mAh
Rate53.96Wh
Net Weight249g /8.78 oz
Gross Weight389g /13.72 oz
Approximate Weight389g /13.72 oz
Dimension 145.60 x 113.25 x 11.10mm

Product Highlights

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

Frequently Asked Questions

My Sager NP8955 BIOS says the new battery is at 0% health — is the cell dead already?

No — the BIOS is reading stale EEPROM data from the previous pack and hasn't validated the new cell yet. This is a calibration gap, not a battery fault. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%, and repeat once more. After two complete cycles the BIOS health reading will update to reflect the new cell's actual condition.

Windows Battery Report shows a different Wh rating than the 53.96Wh listed on the product page — why?

The Wh figure Windows reports is pulled from the battery pack's EEPROM, which stores the rated capacity programmed at the factory. If the EEPROM value from our cell's firmware differs slightly from what the old pack reported, Windows will show a different number in the report. This does not affect how the cell charges or discharges — cross-check by letting the laptop run on battery and confirming it holds a charge normally rather than relying on the reported Wh figure alone.

The charge stops at 80% and never reaches 100% on my NP8973 — is there a fault with the cell?

This is almost always the BIOS battery charge limit setting, not a problem with the cell itself. Clevo firmware includes a charge threshold feature — sometimes enabled by default or carried over from a previous OS configuration — that caps charging at 80% to reduce long-term cell stress. Go into the Clevo Control Center application or the BIOS power settings, locate the battery charge limit or threshold option, and set it to 100%.

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