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Smart Tec GreenNote DR36 Replacement Battery 12V 3800mAh

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From $89.99 USD $110.99
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Fits Smart Tec GreenNote notebook; replaces OEM part number DR36 or DR36S.
12V 3800mAh Ni-MH chemistry delivers 45.6Wh total energy output for full session runtime on this laptop model.
Connector type matches GreenNote dock slot; 139.5 x 89.0 x 20.0mm footprint seats flush without adapter tabs.
Bench test confirmed BMS accepted charge cycle; voltage held steady through discharge without early cutoff fault.
After install, run one full discharge to hibernation-cutoff then charge uninterrupted to 100% to reset BIOS battery learn cycle.
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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

12V

Amp

3800mAh

Smart Tec GreenNote — 12V Ni-MH Replacement Battery (DR36)

This is a 12V Ni-MH battery rated at 3800mAh (45.6Wh), built to fit the Smart Tec GreenNote laptop. It replaces OEM part numbers DR36 and DR36S. When the original cell no longer holds a charge, this unit restores portable operation to the notebook.

  • GreenNote platform fit: The DR36 and DR36S share the same 12V rail, connector pinout, and BMS handshake profile on the GreenNote board. Either part number slots into the same bay without hardware modification.
  • Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and BMS cutoff on the GreenNote. The protection circuit tripped cleanly at low-voltage threshold, and charge acceptance held steady across repeat cycles without throttling.
  • Post-install calibration on the GreenNote: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This single cycle resets the BIOS battery learn cycle and clears the inaccurate health warning the GreenNote commonly shows after any cell swap.

BIOS reporting poor battery health immediately after fitting a new DR36

The GreenNote BIOS reads health data from EEPROM stored on the battery controller, not from live cell measurements. When a new cell goes in, that EEPROM data does not match what the firmware expects from a fresh pack. The BIOS flags it as degraded because it is comparing old cycle-count records against the new cell. Running the learn cycle — full discharge to hibernate, then a full uninterrupted charge — rewrites the relevant flags and clears the warning.

GreenNote shutting down abruptly when the OS gauge shows 20–25% remaining

This is a voltage cliff, not a gauge error. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC can track. The BIOS triggers an emergency shutdown before the displayed percentage reaches zero. The fix is to complete two or three full calibration cycles so the fuel gauge IC maps the actual discharge curve of the new Ni-MH cell. After calibration, the shutdown point and the displayed percentage align correctly at or below 5%.

Compatible Models

GreenNote

Replaces Part Numbers

DR36 DR36S

Technical Specifications

Voltage12V
Amp Hours3800mAh
Capacity3800mAh
Rate45.6Wh
Gross Weight150g /5.29 oz
Approximate Weight150g /5.29 oz
Dimension 139.50 x 89.00 x 20.00mm

Product Highlights

  • Brand: Smart Tec
  • 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 GreenNote BIOS shows 0% or "unknown" right after I put in the new battery — is the cell dead?

It is not dead. The BIOS is reading stale EEPROM data from the previous battery's controller and has not yet mapped the new cell. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. That learn cycle rewrites the EEPROM flags and the BIOS will report an accurate state of charge from the next boot.

My GreenNote shuts off suddenly while the battery gauge still shows around 20% — why does this keep happening?

The fuel gauge IC has not yet calibrated its discharge curve against the new Ni-MH cell. Under full CPU and display load, the cell voltage drops to the BIOS cutoff threshold before the displayed percentage catches up. Run two to three complete discharge-to-hibernate then full-charge cycles. After those calibration passes, the gauge and the actual cutoff voltage will align, and the shutdown will stop happening above 5%.

System information shows the wrong Wh rating for this battery — it does not match the 45.6Wh on the listing.

The figure shown in system info is pulled from the EEPROM on the battery controller, which stores the rated capacity written at the factory. The GreenNote's firmware may display a different value if the EEPROM profile does not match the exact Wh figure it expects for that bay. This is a data mismatch between the controller EEPROM and the OS, not a fault with the cell itself. Check the actual voltage and charge acceptance — if both are normal, the cell is performing correctly regardless of what the Wh field displays.

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