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Enz K36N Replacement Battery 14.8V 4000mAh Li-Polymer

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From $83.99 USD $103.99
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Fits Asus ROG K36N, R34, M15RX, and GB-15N36 laptops; replaces OEM part number 20160901.
14.8V 4000mAh Li-Polymer cell delivers 59.2Wh — matches original pack output for full gaming sessions.
Connector type is proprietary Asus; orientation locks into the battery bay slot without adapters.
We bench-tested this cell in a K36N unit; BMS accepted the new pack on first insertion with no fault codes.
After installation, discharge fully to shutdown then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

14.8V

Amp

4000mAh

Enz K36N / R34 / M15RX Series — 14.8V Li-Polymer Replacement Battery (20160901)

This Enz 14.8V 4000mAh (59.2Wh) Li-Polymer battery replaces part number 20160901 in Asus ROG notebooks including the K36N, R34, M15RX, and GB-15N36. It fits the original connector and BMS interface on these models. Install it when the factory cell no longer holds charge or the laptop won't run unplugged.

  • K36N / R34 / M15RX platform fit: These models share the same 14.8V four-cell pack geometry, connector pinout, and BMS handshake protocol — which is why a single OEM part number covers the full range.
  • Bench tested on actual hardware: We ran the 20160901 through full charge and discharge cycles on K36N hardware. The BMS authenticated correctly, charge termination triggered at 100%, and the protection circuit tripped at the expected low-voltage cutoff without false positives.
  • Post-swap calibration for the K36N: After fitting this battery, run one full discharge to 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 cell swap on Asus ROG models.

Why the K36N shuts down at 20–30% after a battery swap

The Asus ROG BIOS tracks a voltage-versus-capacity curve from the previous cell. When a new cell goes in, that curve no longer matches reality. Under full CPU and display load, the system sees a rapid voltage drop near 30% and interprets it as a critical low-voltage event — triggering shutdown even though charge remains. Running two full discharge-to-hibernate cycles recalibrates the fuel gauge IC against the new cell's actual discharge curve. After calibration, shutdowns at false low percentages stop.

BIOS reporting the new battery as 0% or unknown health

The BIOS reads battery health from EEPROM data written by the original factory cell. A replacement cell ships with fresh EEPROM values that don't match the stored wear history — so the BIOS flags it as unknown or reports 0% health immediately after install. This is a data mismatch, not a faulty battery. Perform the full discharge-to-hibernate then uninterrupted charge cycle; the BIOS learn cycle overwrites the stale EEPROM snapshot and health reporting normalises, typically within two full cycles.

Compatible Models

K36N R34 M15RX GB-15N36 GB-15X36 X36U X36A X36E-3 N36 K36P K36 X36E K36A X36 Pro

Replaces Part Numbers

20160901

Technical Specifications

Voltage14.8V
Amp Hours4000mAh
Capacity4000mAh
Rate59.2Wh
Net Weight260g /9.17 oz
Gross Weight400g /14.11 oz
Approximate Weight400g /14.11 oz
Dimension 212.70 x 68.35 x 13.50mm

Product Highlights

  • Brand: Enz
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Asus ROG K36N shows the new battery at 0% health in BIOS right after I installed it — is the cell dead on arrival?

The BIOS is reading stale EEPROM data from the old cell, not the actual state of the new one. It flags the mismatch as poor or unknown health because the stored wear history doesn't match the fresh cell's values. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100% — the BIOS battery learn cycle will rewrite the health data. After one or two full cycles the health reading corrects itself.

The fuel gauge on my K36N is jumping around — it shows 60%, then skips to 40%, then back up — why is the percentage so erratic after swapping the battery?

The fuel gauge IC calibrates its capacity model against real charge and discharge data from the cell it's tracking. After a swap, it has no baseline for the new cell and interpolates wildly from the old data. The gauge stabilises after two to three full discharge-to-100% charge cycles, which give the IC enough data points to build an accurate curve. Until then, treat the percentage as approximate and avoid letting it run below 10% shown.

Windows Device Manager lists the Wh rating for this battery as lower than the 59.2Wh on the product page — is there a mismatch?

The Wh value Windows reads comes from the EEPROM on the cell, which stores the manufacturer's rated capacity at the time of production. The product data shows 59.2Wh as the rated spec for the 20160901 cell at the nominal 14.8V. Small discrepancies between what's stored in EEPROM and what Windows calculates can occur due to rounding or firmware versioning. Run the BIOS battery learn cycle — a full discharge to hibernate then a full uninterrupted charge — and check Device Manager again; the reported value typically aligns closer to spec once the BIOS has a real measurement to work from.

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