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Acer Extensa 610 10.8V Replacement Battery BTP-X31 4000mAh

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From $87.99 USD $108.99
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Fits Acer Extensa 610, 610CD, 610CDT notebook; replaces BTP-X31, BTP-W31, 60.46914.051, 91.46928.010, 91.48428.051, 60.46914.061.
10.8V Ni-MH pack delivers 4000mAh; sustains CPU and display load without voltage sag under full draw.
Connector type is fixed bayonet; slides into bay until locking tab seats fully into the frame.
We tested the BMS response on first insert—no charge delays, cells balanced across all three stages.
After installation, run one full discharge to hibernate-cutoff then charge uninterrupted to 100% to reset BIOS battery learn cycle and clear false health warnings.
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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

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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

10.8V

Amp

4000mAh

Texas Instruments Extensa 610 Series — 10.8V Ni-MH Replacement Battery (BTP-X31)

This is a 10.8V, 4000mAh (43.2Wh) Ni-MH replacement battery pack for the Acer Extensa 610 series notebook. It fits the Extensa 610, 610CD, 610CDT, and 616CDS. It replaces OEM part numbers BTP-X31, BTP-W31, and 60.46914.051, among others.

  • Extensa 610 series fit: The 610, 610CD, 610CDT, and 616CDS all share the same battery bay dimensions and connector pinout. The BTP-X31 form factor spans all four variants with no adapter or modification needed.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Extensa platform. The BMS accepted charge handshake correctly, held voltage through mid-discharge, and did not trip on the laptop's charge termination signal.
  • First-use cycle on Ni-MH: After installation, run the battery down fully until the laptop hibernates, then charge uninterrupted to 100%. Ni-MH cells need this initial full cycle to let the BIOS battery learn routine establish accurate capacity tracking against the new chemistry.

BIOS reporting poor battery health immediately after swapping the Extensa 610 cell

The Extensa 610 BIOS reads health data stored in the battery pack's EEPROM. When a new cell ships, its EEPROM data does not yet match the charge history the BIOS expects. The system flags it as degraded or unknown — this is a data mismatch, not a fault with the cell. Running one full discharge-to-hibernate followed by a complete uninterrupted charge resets the learn cycle and clears the warning in most cases.

Extensa 610 shutting down at 20–30% charge shown on screen

This happens when the cell voltage drops below the BIOS cutoff threshold under full load — CPU plus display drawing more current than the fuel gauge predicted. The gauge was calibrated against the old cell's discharge curve, not the new one. Run two full discharge-to-hibernate and uninterrupted charge cycles to let the fuel gauge IC recalibrate against the new cell's actual voltage curve. After the second full cycle, the shutdown point should track back to near 5%.

Compatible Models

Extensa 610 Extensa 610CD Extensa 610CDT Extensa 616CDS Extensa 616CDT

Replaces Part Numbers

BTP-X31 BTP-W31 60.46914.051 91.46928.010 91.48428.051 60.46914.061

Technical Specifications

Voltage10.8V
Amp Hours4000mAh
Capacity4000mAh
Rate43.2Wh
Gross Weight150g /5.29 oz
Approximate Weight150g /5.29 oz
Dimension 215.00 x 57.40 x 21.55mm

Product Highlights

  • Brand: Texas Instruments
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Extensa 610 BIOS shows 0% or "unknown" right after I put the new battery in — is it dead?

No. The BIOS is reading EEPROM data from the new cell that does not match its stored charge history, so it reports the status as unknown or zero. This is a data mismatch, not a cell fault. Run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. After that cycle, the BIOS learn routine will write new baseline data and the reading will correct itself.

The fuel gauge on my Extensa 610 jumps around wildly — shows 60%, then 80%, then 45% within minutes of unplugging.

The fuel gauge IC is still calibrated against the discharge curve of the old cell. It loses accuracy the moment a new cell with a different curve is installed. We see this on the bench for the first two to three full cycles. Run two complete discharge-to-hibernate and charge-to-100% cycles without interruption. By the third cycle the gauge IC will have enough data points to track the new cell accurately.

My Extensa 610 replacement battery shows a different Wh rating in system info than the spec sheet says — did I get the wrong one?

The Wh figure in system info pulls from the EEPROM value written when the cell was manufactured, which can differ slightly from the rated spec due to chemistry tolerance. As long as the voltage reads 10.8V and the part number matches BTP-X31 or the listed OEM equivalents, the cell is correct. The EEPROM Wh value will update to reflect actual measured capacity after the BIOS completes its battery learn cycle — run one full discharge-to-hibernate and a complete charge to trigger it.

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