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TECHMEDIA DR35 10.8V Laptop Replacement Battery 4000mAh

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From $84.99 USD $104.99
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Fits TECHMEDIA Model 3000S laptop; replaces OEM part numbers DR35 and DR35S.
10.8V, 4000mAh Ni-MH chemistry delivers 43.2Wh — matches original capacity for full runtime on this notebook platform.
Connector slides straight into the battery bay slot with positive terminal forward; locking tab seats flush against the chassis edge.
Bench tested on Model 3000S — BMS accepted full charge cycle without cutoff faults; voltage held steady under sustained load draw.
After installation, discharge fully to hibernation cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after 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.

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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

10.8V

Amp

4000mAh

TECHMEDIA Model 3000S — 10.8V Ni-MH Replacement Battery (DR35)

This is a 10.8V, 4000mAh Ni-MH replacement battery for the TECHMEDIA Model 3000S notebook. It fits directly in place of OEM part numbers DR35 and DR35S. Use it when the original cell no longer holds a charge or the laptop fails to power on from battery.

  • Model 3000S fit: The DR35 and DR35S share the same connector pinout, voltage rail, and BMS handshake protocol on the Model 3000S. Both OEM numbers cross to this cell without modification.
  • Bench tested on actual hardware: We cycled this cell through charge, load, and discharge on the Model 3000S platform. The BMS accepted the cell, reported state-of-charge correctly after two calibration cycles, and held voltage under sustained CPU and display load without triggering a low-voltage cutoff.
  • First-cycle reset on the Model 3000S: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or unknown-battery warning that typically appears after every cell swap on this platform.

BIOS reporting poor health or unknown battery after fitting the DR35

When you swap a Ni-MH cell, the BIOS reads EEPROM data left over from the old battery. The health flag it raises reflects the previous cell's recorded state, not the new one. The Model 3000S does not automatically clear this flag on first boot. Run one full discharge to hibernate, then a full uninterrupted charge — the BIOS learn cycle rewrites the EEPROM baseline against the new cell and the warning clears.

Model 3000S shuts down at 20–30% battery shown on screen

This is a voltage cliff, not a capacity fault. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC can track, and the BIOS hits its low-voltage cutoff before the displayed percentage reaches zero. The fuel gauge IC needs two or three full calibration cycles against the new cell to map the discharge curve accurately. Complete two full discharge-to-hibernate and charge-to-100% cycles — after that, the gauge and the actual cutoff voltage align and the early shutdown stops.

Compatible Models

Model 3000S

Replaces Part Numbers

DR35 DR35S

Technical Specifications

Voltage10.8V
Amp Hours4000mAh
Capacity4000mAh
Rate43.2Wh
Gross Weight140g /4.94 oz
Approximate Weight140g /4.94 oz
Dimension 214.50 x 52.00 x 18.50mm

Product Highlights

  • Brand: TECHMEDIA
  • 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

My TECHMEDIA Model 3000S shows the new battery as 0% or "unknown" in Windows — is the cell dead?

No — the OS fuel gauge IC is reading stale EEPROM data written by the old cell, not the actual charge state of the new DR35. The gauge needs calibration cycles before it reports accurately. Discharge fully to hibernate-cutoff, then charge uninterrupted to 100%, and repeat that cycle twice. After two full cycles the reported percentage tracks correctly.

The Model 3000S says the battery Wh rating is wrong after I fitted the DR35 — it shows a different number than the original.

The Wh figure the BIOS displays is pulled from the cell's EEPROM, which stores the rated value from the original factory cell, not a live measurement. The DR35 is rated at 43.2Wh, but until the BIOS learn cycle completes, it may display the old cell's recorded figure or a default fallback. Run one full discharge to hibernate and one full charge to 100% — the BIOS rewrites the EEPROM baseline and the displayed Wh value updates to reflect the new cell.

The replacement battery on my Model 3000S stops charging at around 80% and won't go higher — what's causing that?

This is almost always a BIOS-controlled charge limit, not a fault with the DR35 cell itself. Many TECHMEDIA notebooks ship with a charge ceiling set in firmware to reduce cell wear during prolonged mains use. Check the power management settings in the BIOS setup utility — look for a "battery charge threshold" or "maximum charge" option and set it to 100%. If no such setting exists, complete a full battery learn cycle by discharging to hibernate-cutoff and charging uninterrupted; some firmware versions only apply the full charge ceiling after the learn cycle runs once.

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