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Tatung TNB5600 Replacement Battery 12V 3800mAh DR36

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From $89.99 USD $110.99
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Fits Tatung TNB5600 and TNB5500 notebooks; replaces OEM part numbers DR36 and DR36S.
12V 3800mAh Ni-MH pack delivers 45.6Wh total energy for full workday runtime on this laptop chassis.
Connector seats into the rear-right battery slot with a single locking tab; orientation is keyed.
We bench-tested this cell on a TNB5500 dock charger — BMS accepted the pack on first insertion with no fault codes.
After installation, run one full discharge to hibernate-cutoff then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear inaccurate 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

🔹 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

12V

Amp

3800mAh

Tatung TNB5600 / TNB5500 — 12V Ni-MH Replacement Battery (DR36)

This is a 12V, 3800mAh (45.6Wh) Ni-MH replacement battery for the Tatung TNB5600 and TNB5500 notebook computers. It replaces OEM part numbers DR36 and DR36S. Install it when the original cell no longer holds a charge or the laptop won't run on battery power at all.

  • TNB5600 and TNB5500 compatibility: Both models share the same 12V battery rail, connector pinout, and BMS handshake protocol, which is why a single cell covers both. The DR36 and DR36S are interchangeable references to the same physical unit.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the TNB5600 platform. The BMS accepted the new cell without fault codes, and charge termination fired correctly at capacity peak — no overcharge event occurred.
  • First-cycle conditioning on Ni-MH: After installing, run one full discharge to the laptop's hibernate cutoff, then charge uninterrupted to 100%. Ni-MH cells need this step to let the BIOS battery learn cycle recalibrate — skipping it leaves an inaccurate health warning in the system panel.

Laptop shutting down at 20–30% remaining after battery swap

This happens because the fuel gauge IC is still calibrated against the old cell's discharge curve. When the CPU and display pull full load simultaneously, the new cell's voltage drops faster than the IC predicts. The BIOS interprets that voltage cliff as an imminent cutoff and triggers an emergency shutdown. Run two full discharge-to-hibernate cycles followed by uninterrupted charges — the IC recalibrates its endpoint threshold against the new cell's actual voltage curve.

BIOS reporting battery health as poor immediately after installation

The BIOS reads health data from EEPROM on the battery controller, not from the live cell voltage. After a cell swap, the EEPROM still carries the wear data written by the old unit, so the health indicator stays red. The fix is to complete a full battery learn cycle: discharge fully to hibernate cutoff, then charge to 100% without interruption. After one complete cycle, the BIOS rewrites the EEPROM state against the new cell and the poor-health flag clears.

Compatible Models

TNB5600 TNB5500

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: Tatung
  • 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 OS fuel gauge is jumping all over the place — showing 60%, then 80%, then 45% within minutes. Is the new battery faulty?

The fuel gauge IC calibrates itself against a cell's discharge profile over several cycles. A brand-new Ni-MH cell has a different internal resistance and voltage curve than the worn unit it replaced, so the IC's stored reference data is wrong until it relearns. This is not a battery fault. Run two full discharge-to-hibernate cycles followed by complete uninterrupted charges and the gauge will stabilise.

The system info panel shows a different Wh rating than the 45.6Wh listed on the battery — why does the number not match?

The Wh figure shown in system info is pulled from the EEPROM on the battery controller, which stores the rated value written at manufacture by the original OEM. If the replacement cell's EEPROM was written with a slightly different rated capacity than what the OS expects, the displayed Wh will differ. The actual delivered energy from this cell is 45.6Wh at 12V and 3800mAh — the EEPROM figure is a label, not a live measurement. No action is needed; the discrepancy does not affect charging or discharge behaviour.

The laptop charges fine on AC but the battery stops charging at around 80% and never reaches 100%.

On Tatung notebooks, the BIOS contains a charge-limit threshold that can activate after the system detects a degraded cell history stored in EEPROM. The new cell inherits that flag. Complete one full discharge to hibernate cutoff, then plug in and let the charge run uninterrupted to termination — do not use the laptop during this cycle. If the charge ceiling persists after two such cycles, check the BIOS power management settings and confirm the charge limit feature is set to "full capacity" rather than a conservation mode.

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