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Wedge Tech DR36 PowerBook 5CD Replacement Battery 12V

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From $89.99 USD $110.99
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Fits Apple PowerBook 5CD; replaces OEM part numbers DR36 and DR36S.
12V, 3800mAh capacity delivers 45.6Wh — restores full runtime on aging PowerBook 5CD systems.
Connector type matches original DR36 housing; slides into battery bay with locking tab engagement.
Bench testing on PowerBook 5CD showed clean BMS handshake on first insertion; voltage held steady under load.
On first charge after install, run one full discharge to sleep cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings common 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.

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

Wedge Tech PowerBook 5CD — 12V Ni-MH Replacement Battery (DR36)

This is a 12V, 3800mAh Ni-MH replacement battery for the Apple PowerBook 5CD notebook computer. It fits directly in place of OEM part DR36 and DR36S. Capacity is rated at 45.6Wh, matching the original cell specification.

  • PowerBook 5CD compatibility: The 5CD uses a dedicated 12V Ni-MH pack with a fixed connector and BMS handshake tied to the OEM DR36 form factor. This cell matches that voltage rail and connector pinout, so the logic board recognises it without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a PowerBook 5CD chassis. The BMS accepted the cell without fault codes, and charge termination triggered correctly at full capacity with no overrun.
  • First-cycle conditioning for Ni-MH cells: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. Ni-MH cells in this platform require that cycle to reset the BIOS battery learn cycle and clear the inaccurate health warning that appears after every cell swap.

Why the PowerBook 5CD shuts down at 20–30% remaining after a battery swap

The PowerBook 5CD fuel gauge IC was calibrated against the original cell's discharge curve. A new Ni-MH cell has a slightly different voltage-to-capacity curve, so the IC miscalculates the remaining charge. Under combined CPU and display load, the cell hits a voltage cliff that the gauge didn't predict. Running one full discharge-to-hibernate cycle followed by a full uninterrupted charge gives the fuel gauge IC the data it needs to recalibrate against the new cell.

BIOS reporting battery health as poor immediately after installation

The BIOS stores battery health data in EEPROM tied to the original cell's cycle history. When a new cell goes in, that stored data doesn't match the new cell's state, so the BIOS flags it as degraded. This is a data mismatch, not a fault with the replacement cell. Complete one full discharge-to-hibernate cycle and one full uninterrupted charge — the BIOS battery learn cycle will rewrite the EEPROM and the health warning will clear.

Compatible Models

PowerBook 5CD

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: Wedge Tech
  • 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 PowerBook 5CD fuel gauge jumps around wildly for the first few charges after I swapped the battery — is something wrong with the new cell?

Nothing is wrong with the cell. The fuel gauge IC on the PowerBook 5CD needs several calibration cycles to build an accurate discharge curve against the new Ni-MH chemistry. Run two to three full discharge-to-hibernate cycles followed by full uninterrupted charges and the gauge will stabilise. After that, readings should track consistently across the battery's range.

The BIOS shows the replacement battery's Wh rating as different from the original — why doesn't it match the 45.6Wh spec?

The Wh figure the BIOS displays is pulled from EEPROM data written by the original OEM cell, not measured from the new cell in real time. The stored value reflects the old cell's rated chemistry and doesn't update automatically on swap. Run a full discharge-to-hibernate cycle followed by a complete uninterrupted charge to trigger the BIOS battery learn cycle, which will overwrite the stale EEPROM entry with values aligned to the new cell.

My PowerBook 5CD stops charging at around 80% and never reaches 100% — is this a fault with the replacement battery?

On the PowerBook 5CD, charge cutoff at 80% is typically controlled by BIOS firmware, not the battery itself. The BIOS can impose a charge limit if it detects what it interprets as a degraded cell based on stale EEPROM data from the previous battery. Complete one full discharge-to-hibernate cycle then charge uninterrupted from 0% — once the BIOS battery learn cycle runs against the new cell, the charge limit should lift and the cell should reach 100%.

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