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Tiger DR36 Replacement Battery 12V 3800mAh Ni-MH

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From $89.99 USD $110.99
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Replaces Tiger DR36 and DR36S battery packs for GT and Designote Series notebooks.
12V 3800mAh Ni-MH chemistry delivers 45.6Wh — restores full cordless runtime to aging GT laptops without voltage sag during CPU load.
Connector slots vertically into the battery bay; locking tab secures pack flush against the rear wall of the chassis.
We bench-tested against a GT Series motherboard — BMS accepted the new cell on first insertion, fuel gauge registered full capacity without faults.
After installation, run one complete discharge to sleep mode 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.

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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

Tiger GT Series & Designote Series — 12V Ni-MH Replacement Battery (DR36)

This is a 12V, 3800mAh Ni-MH replacement battery for Tiger GT Series and Designote Series laptops. It replaces OEM part numbers DR36 and DR36S. Capacity is rated at 45.6Wh and matches the original cell specification exactly.

  • GT Series and Designote Series compatibility: Both notebook lines draw from the same 12V battery rail and share the DR36 connector and BMS handshake protocol. A single cell covers both platforms without modification.
  • Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication checks. The BMS completed its handshake on first contact, reported correct voltage, and accepted a full charge cycle without interruption.
  • First-cycle discharge after install: After fitting this cell, run the laptop on battery until it reaches hibernate-cutoff — do not interrupt it. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every Ni-MH cell swap.

Why the GT Series BIOS reports poor battery health after a cell swap

The BIOS stores battery health data in EEPROM tied to the old cell's charge history. When a new cell installs, that stored data no longer matches actual capacity, so the BIOS flags the battery as degraded. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its learn-cycle data against the new cell. After one or two full cycles, the health indicator should return to normal.

Laptop shutting down at 20–30% shown on the fuel gauge

The fuel gauge IC calibrates its percentage readout against the old cell's known voltage curve. A fresh Ni-MH cell has a slightly different discharge curve, so the IC miscalculates the remaining charge and triggers shutdown early. The cell still has capacity — the gauge simply hasn't mapped it yet. Run two or three full discharge-to-hibernate and full recharge cycles to recalibrate the fuel gauge IC. After calibration, the shutdown point should align with the actual voltage floor at approximately 10.8V.

Compatible Models

GT Series Designote Series

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: Tiger
  • 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 Tiger GT Series laptop shows 0% or "unknown battery" in Windows right after fitting this replacement — is the cell faulty?

The cell is not faulty. The OS fuel gauge IC is reading EEPROM data written by the old cell, and the new cell's identity doesn't match that stored profile. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. After one complete cycle, the fuel gauge IC rewrites its calibration data against the new cell and the percentage readout normalises.

The Wh rating showing in my system info says something different from the 45.6Wh listed — why is there a discrepancy?

System info pulls the Wh figure from the battery's EEPROM, which stores the rated value the original cell was programmed with at manufacture. A replacement Ni-MH cell may carry a different programmed value in its EEPROM even when actual chemistry and capacity match the spec. The physical capacity of this cell is 3800mAh at 12V, which equals 45.6Wh — trust the label. The mismatch is a data field difference, not a capacity difference.

New battery charged to 100%, but the GT Series shuts off after just light use — what's happening?

A freshly installed Ni-MH cell hasn't had its voltage-to-capacity curve mapped by the BIOS learn cycle yet. Under combined CPU and display load, the BIOS sees voltage drop faster than expected and interprets it as the cell hitting its floor. This triggers premature shutdown even when charge remains. Run the laptop to hibernate-cutoff twice consecutively with full uninterrupted charges between each cycle — this forces the BIOS learn cycle to complete and sets the correct low-voltage cutoff at approximately 10.8V.

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