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Gateway NV52 Replacement Battery 11.1V 8800mAh AS09A31

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From $123.99 USD $148.99
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Fits Gateway NV52 and NV5207U–NV5212U series notebooks; replaces AS09A31, AS09A41, AS09A56, AS09A61, AS09A71, AS09A73, AS09A75, AS09A90.
11.1V at 8800mAh delivers 97.68Wh; sustains full CPU and display load without voltage sag on this platform.
Connector slides into the battery bay with a locking tab on the right side; orientation marked on the slot itself.
We bench-tested this cell in an NV5211U; the BMS accepted the handshake on first insertion and held 11.1V stable through a full discharge cycle.
After installation, run one full discharge to hibernate cutoff then charge uninterrupted to 100% — this resets the Gateway BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
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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

11.1V

Amp

8800mAh

Gateway NV52 Series — 11.1V Li-ion Replacement Battery (AS09A31)

This is an 11.1V, 8800mAh Li-ion replacement battery for the Gateway NV52 series of notebook computers. It fits the NV52, NV5207U, NV5211U, NV5212U, and over 59 additional NV-series variants. Capacity is 97.68Wh — matching the original cell specification for this platform.

  • NV52-series platform fit: These models share a common battery bay connector, BMS handshake protocol, and 11.1V three-cell voltage rail. Any model on the AS09A31 compatibility list uses the same EEPROM battery data structure, so the replacement cell communicates with the BIOS without modification.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on NV52 hardware. The BMS accepted the handshake immediately, the BIOS recognised the cell as a valid pack, and charge current stepped down correctly at the 80% and 100% thresholds as expected from Gateway's firmware.
  • First-cycle calibration on NV52: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity, clearing the inaccurate health warning that typically appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The Gateway NV52 BIOS stores learned capacity data from the previous cell in non-volatile memory. When a new cell goes in, that stored data no longer matches the actual pack chemistry, so the BIOS flags the battery as degraded before it has run a single cycle. This is not a fault with the replacement cell — it is stale EEPROM data from the old pack. Run one complete discharge-to-hibernate cycle followed by a full uninterrupted charge to 100%, and the BIOS will rewrite its health record against the new cell.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reports 25% remaining, but the cell hits its low-voltage cutoff cliff under combined CPU and display load before the OS receives a low-battery warning. The fix is the same calibration cycle — discharge fully to hibernate, charge straight to 100% without interruption. After two full cycles the fuel gauge IC maps the new cell's voltage curve accurately, and shutdowns at falsely high percentages stop. Target voltage at full charge is 12.6V across the pack.

Compatible Models

NV52 NV5207U NV5211U NV5212U NV5213U NV5214U NV5215U NV5216U NV53 NV5302U NV5331U NV5332U NV5333U NV5334U NV5335U NV5336U NV5337U NV5356U NV5362U NV5369ZU NV5370U NV5373U NV5376U NV5378U NV5380U NV5381U NV5383U NV5384U NV5385U NV5386U NV5387U NV5388U NV5389U NV5390U NV54 NV5421U NV5423U NV5425U NV5435U NV5453U NV5462U NV5465U NV5468U NV5469ZU NV5470U NV5471U NV5473U NV5474U NV5478U NV56 NV5602U NV5606U NV5610U NV5613U NV5614U NV58 NV5807U NV5810U NV5814U NV5815U NV5820U NV78 NV7802U

Replaces Part Numbers

AS09A31 AS09A41 AS09A56 AS09A61 AS09A71 AS09A73 AS09A75 AS09A90 ASO9A31 ASO9A41 ASO9A56 ASO9A6 ASO9A71 ASO9A73 ASO9A75 ASO9A90

Technical Specifications

Voltage11.1V
Amp Hours8800mAh
Capacity8800mAh
Rate97.68Wh
Net Weight592.9g /20.91 oz
Gross Weight772.9g /27.26 oz
Approximate Weight772.9g /27.26 oz
Dimension 207.63 x 60.40 x 40.22mm

Product Highlights

  • Brand: Gateway
  • 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 Gateway NV52 shows 0% battery and "plugged in, not charging" right after fitting the new cell — what's wrong?

The fuel gauge IC on the NV52 sometimes loses its reference point entirely when the old cell is swapped out, and reports 0% or an unknown state until it completes at least one calibration cycle. Plug the laptop in, let it charge to 100% without interrupting it, then discharge fully to hibernate cutoff. That sequence re-initialises the fuel gauge IC against the new cell's chemistry and clears the 0% reading.

System info shows the wrong Wh rating for this battery — it lists a much lower number than 97.68Wh. Is the cell faulty?

The Wh value displayed in Windows or the BIOS is pulled from the EEPROM data stored on the battery pack, not measured in real time. The old cell's rated Wh value can persist in system records until the BIOS completes a full learn cycle. Run one full discharge to hibernate and one uninterrupted charge to 100% — the BIOS will rewrite the Wh figure to match the new cell's 97.68Wh rating once the learn cycle is complete.

The NV52 fuel gauge counts down erratically — jumping from 60% to 40% in minutes, then sitting at 35% for a long stretch. Is this a bad cell?

Erratic fuel gauge behaviour on the first few cycles is caused by the gauge IC mapping its discharge curve against the old cell's profile, which no longer matches the new chemistry. It does not mean the cell is defective. Run two full discharge-to-hibernate cycles with uninterrupted charges to 100% in between. By the third cycle the gauge IC has enough data points to track the new cell's voltage curve accurately, and the percentage readout stabilises.

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