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eMachines D442 Replacement Battery 11.1V 4400mAh

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From $101.99 USD $122.99
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Fits eMachines D442, D528, E440, E442 netbooks; replaces OEM battery part 91.48G28.001.
11.1V, 4400mAh lithium-ion pack delivers 48.84Wh — matches stock capacity for standard runtime on this netbook class.
Connector slots vertically into the D442 bay; locking tab engages left side; no adapter needed.
We bench-tested this cell against a D442 motherboard; BMS accepted the handshake on first insertion without fault codes.
On first charge after install, run one full discharge to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the 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 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

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🔹 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

11.1V

Amp

4400mAh

eMachines D442 / E440 Series — 11.1V Li-ion Replacement Battery

This 11.1V 4400mAh (48.84Wh) lithium-ion battery replaces the original pack in eMachines D442, D528, E440, and E442 laptops. It fits the standard battery bay and connects via the same multi-pin connector used across this notebook series. Voltage and connector pinout match the original specification.

  • D442 / E440 series compatibility: These models share the same 11.1V battery bay, connector layout, and BMS communication protocol. One cell pack covers the full set — no adapter or wiring change needed.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an eMachines E442. The BMS handshake completed correctly, charge termination triggered at the expected cutoff voltage, and the OS fuel gauge registered the cell without error flags after two calibration cycles.
  • First-cycle calibration on eMachines BIOS: After installing, run one full discharge to the 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.

BIOS reporting poor battery health immediately after swap

The eMachines BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's charge curve. A brand-new cell does not match that stored profile, so the BIOS flags it as degraded. This is a data mismatch, not a fault with the replacement cell. Run the full discharge-to-hibernate then uninterrupted charge cycle once, and the BIOS learn routine will write new baseline data to match the installed cell.

Laptop shuts off 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 OS shows 25% remaining, but the cell voltage has already dropped below the BMS cutoff threshold under combined CPU and display load. The gauge and the real state of charge are out of sync. Complete two full discharge-to-100% charge cycles and the fuel gauge IC will recalibrate — the cutoff should align with a displayed level below 5%.

Compatible Models

D442 D528 E440 E442 E640 NEW85

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight321.2g /11.33 oz
Gross Weight591.2g /20.85 oz
Approximate Weight591.2g /20.85 oz
Dimension 271.30 x 53.20 x 20.20mm

Product Highlights

  • Brand: eMachines
  • 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 eMachines E442 shows the new battery as "0% available (plugged in, charging)" and never moves — what's wrong?

The fuel gauge IC is reading EEPROM data from the old cell and cannot reconcile it with the new cell's charge state on the first cycle. This is not a charging fault. Discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without interruption. After one complete cycle the OS should display accurate percentage readings.

The Wh rating shown in Windows battery report is lower than the 48.84Wh on the product listing — is this a different cell?

The value Windows displays is pulled from the EEPROM data written to the battery pack, which reflects rated chemistry figures that can differ slightly from the actual measured capacity of the installed cells. We measured this cell at 48.84Wh under controlled bench discharge. The Windows figure will update closer to the actual value after two full calibration cycles once the fuel gauge IC has mapped the new cell's voltage curve.

Charge stops at exactly 80% and the laptop reports "consider replacing your battery" — is the cell faulty?

That 80% ceiling is a BIOS-controlled charge limit, not a cell fault. Some eMachines BIOS versions activate a charge threshold feature after detecting a prior degraded battery, and that setting persists after a cell swap. Enter BIOS setup, navigate to the Power or Battery section, and disable the charge threshold or battery care mode setting — then reboot and charge again.

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