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Gateway NV78 Notebook Replacement Battery 14.8V 4400mAh

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From $77.99 USD $95.99
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Fits Gateway NV78 notebook; replaces OEM battery for this model.
14.8V, 4400mAh capacity delivers 65.12Wh — sufficient for mid-range mobile workload on this consumer chassis.
Connector slides into the NV78 battery slot with single locking tab; orientation marked on housing.
Bench tested on NV78 motherboard; BMS accepted the cell on first charge cycle without fault code.
After installation, run one full discharge to hibernation-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after every 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.

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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

14.8V

Amp

4400mAh

Gateway NV78 — 14.8V Li-ion Replacement Battery

This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Gateway NV78 notebook. It slots into the NV78's battery bay and restores portable operation when the original cell has degraded beyond use. Voltage and connector match the original specification.

  • NV78 platform fit: The NV78 uses a 14.8V four-cell series Li-ion pack. Voltage rail and connector pinout on this replacement match that layout. The BMS handshake on the NV78 reads pack voltage and cell count — both check out on installation.
  • Bench tested on actual hardware: We cycled this cell through charge and full discharge under CPU and display load. The BMS held voltage across the discharge curve and tripped cutoff cleanly at the low-voltage threshold without hard shutdown above it.
  • First-cycle calibration on the NV78: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. The NV78 BIOS uses a battery learn cycle to calibrate its fuel gauge IC against the new cell. Skipping this step causes the health warning and inaccurate percentage readouts that appear after any cell swap.

BIOS reporting poor battery health immediately after swapping cells on the NV78

The NV78 BIOS carries EEPROM data written by the original battery during its service life. When a new cell is installed, that stored data no longer matches the new cell's chemistry profile, triggering a poor health or unknown battery warning. This is a firmware state issue, not a fault with the replacement cell. Run one complete discharge-to-hibernate then a full uninterrupted charge. After two to three cycles, the BIOS overwrites the stale EEPROM values and the health status clears.

NV78 shutting down abruptly at 20–30% charge shown

This happens when the cell voltage drops below what the NV78's power circuit can sustain under combined CPU and display load. The fuel gauge shows 20–30% remaining, but the cell hits a voltage cliff under load before it can deliver those final milliamp-hours. The system cuts power rather than brown out the CPU. Confirm the cell rests at or above 14.4V under light load at the reported 20% mark — if it reads below that, run the full learn cycle again to let the fuel gauge IC recalibrate against the actual discharge curve.

Compatible Models

NV78

Technical Specifications

Voltage14.8V
Amp Hours4400mAh
Capacity4400mAh
Rate65.12Wh
Net Weight402.5g /14.20 oz
Gross Weight552.5g /19.49 oz
Approximate Weight552.5g /19.49 oz
Dimension 205.08 x 70.20 x 20.08mm

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 NV78 shows the battery as 0% or "unknown" straight after fitting a new cell — is it dead on arrival?

It is not a dead cell. The NV78 fuel gauge IC loses its calibration reference when the old battery is removed, so it reports 0% or unknown until it maps the new cell's discharge curve. Charge the battery uninterrupted to 100%, then let the laptop discharge fully to hibernate cutoff. After one or two complete cycles the fuel gauge IC has enough data to report accurately.

The Gateway NV78 BIOS shows the wrong Wh rating after I swapped the battery — it says something different from the label on the new cell.

The Wh figure in BIOS comes from EEPROM data carried over from the old battery, not from the new cell's actual chemistry. The NV78 does not immediately overwrite that value on first install. Run two full discharge-to-hibernate and charge-to-100% cycles. After the learn cycle completes, the BIOS reads the new cell's actual capacity and updates the Wh figure to match.

The NV78 charges fine but the battery percentage jumps around erratically — it reads 60%, then 45%, then 70% within minutes.

Erratic percentage jumps mean the fuel gauge IC has no stable calibration baseline for the new cell. It is interpolating against the old cell's discharge profile, which does not match the new chemistry. Run a full uninterrupted discharge to hibernate cutoff, then charge straight to 100% without interruption. After two calibration cycles the IC locks onto the actual discharge curve and the percentage readout stabilises.

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