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Seanix SeaNote SN238 Replacement Battery 11.1V 4400mAh

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From $73.99 USD $91.99
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Fits Seanix SeaNote SN238 and SN238A-1 notebooks, replacing the original 11.1V lithium-ion battery.
11.1V and 4400mAh capacity deliver 48.84Wh — sufficient to power the SN238 through a full workday on one charge cycle.
Connector type and orientation match the SeaNote battery slot exactly; locking tab seats flush without forcing.
We bench-tested the cell at full discharge under sustained CPU and display load — BMS voltage held stable through cutoff, no early shutdown.
After installation, discharge completely to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false health warnings that appear 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

4400mAh

Seanix SeaNote SN238 / SN238A-1 — 11.1V Li-ion Replacement Battery

This is an 11.1V 4400mAh (48.84Wh) lithium-ion battery for the Seanix SeaNote SN238 and SeaNote SN238A-1 notebooks. It replaces the original cell when the laptop no longer holds a charge or fails to power on without AC. Voltage, connector, and BMS handshake match the original specification for both models.

  • SN238 and SN238A-1 compatibility: Both models share the same 11.1V battery bay, connector pinout, and BMS communication protocol. A single replacement cell covers either variant without modification.
  • Bench tested on actual hardware: We cycled this cell through charge, full load discharge, and BMS cutoff on the SN238 platform. The protection circuit engaged correctly at low-voltage threshold and the charge IC accepted a full charge cycle without interruption.
  • Post-installation calibration: After fitting this cell, 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.

BIOS reporting poor battery health immediately after fitting a new cell

The SeaNote SN238 BIOS reads health data from EEPROM registers on the battery's protection board. When a new cell goes in, those registers still reflect the charge history and degradation profile of the old pack. The BIOS compares current readings against stored values and flags the result as poor health even though the cell is new. One full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite the learn cycle against the new cell's actual capacity curve.

SeaNote SN238 shutting down at 20–30% battery shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The OS displays a percentage based on stale reference data, so the reported figure and actual cell voltage are out of sync. Under full CPU and display load, the cell voltage drops faster than the gauge predicts, hitting the BMS low-voltage cutoff while the screen still shows charge remaining. Run two to three full discharge-and-charge cycles to let the fuel gauge IC re-anchor its reference points — shutdowns should stop once the gauge tracks real cell voltage accurately.

Compatible Models

SeaNote SN238 SeaNote SN238A-1

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight325.4g /11.48 oz
Gross Weight475.4g /16.77 oz
Approximate Weight475.4g /16.77 oz
Dimension 205.40 x 54.29 x 20.20mm

Product Highlights

  • Brand: Seanix
  • 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

The SeaNote SN238 BIOS shows the new battery as "unknown" or 0% — is the cell faulty?

The cell is not faulty. The BIOS is reading EEPROM registers that still hold data from the old pack and cannot yet match them to the new cell's chemistry profile. Discharge the laptop fully to hibernate-cutoff, then charge it uninterrupted to 100%. That single learn cycle rewrites the BIOS reference data and clears the unknown or 0% reading.

Windows is showing the wrong Wh rating for this battery — it doesn't match the 48.84Wh spec on the listing.

The Wh figure Windows reports pulls from EEPROM data embedded in the battery's protection board, not from a live measurement. The stored value reflects the rated chemistry baseline, which can differ slightly from the actual cell capacity once it settles after first use. This is a data-reporting difference, not a capacity fault. After two full discharge-and-charge cycles the fuel gauge IC recalibrates, and the reported Wh figure typically moves closer to the actual 48.84Wh spec.

The replacement battery charges fine but the fuel gauge jumps erratically — showing 80%, then 45%, then 70% within minutes.

The fuel gauge IC on the SN238 uses a voltage-to-percentage lookup table built around the old cell's discharge curve. A new cell has a slightly different voltage profile, so the IC misreads position on the curve and reports erratic percentages. This is normal for the first few cycles after a cell swap. Run three complete discharge-to-hibernate then full-charge cycles and the IC re-maps its lookup table against the new cell — gauge stability improves significantly by the third cycle.

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