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Ahtec Netbook LUG N011 Compatible Battery 11.1V 4400mAh

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Fits Ahtec Netbook LUG N011; replaces OEM battery BTY-S11.
11.1V, 4400mAh lithium-ion delivers stable voltage under sustained CPU and display load.
Connector type and orientation match the original BTY-S11 slot without modification.
We bench-tested this cell against LUG N011 firmware; BMS engaged normally on first charge cycle.
After installation, run one full discharge to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

11.1V

Amp

4400mAh

Ahtec Netbook LUG N011 — 11.1V Li-ion Replacement Battery (BTY-S11)

This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Ahtec Netbook LUG N011. It replaces OEM part number BTY-S11 and fits directly into the LUG N011 chassis without modification. If your original cell no longer holds a charge or your BIOS flags poor battery health, this is the direct swap.

  • LUG N011 platform fit: The LUG N011 uses a shared battery bay connector and BMS handshake tied to the BTY-S11 spec. This cell matches the 11.1V rail and physical connector, so the laptop's charge controller recognises it without driver changes or BIOS workarounds.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the LUG N011 platform and confirmed the BMS accepted the new cell, initiated charge without fault codes, and held voltage steady under sustained CPU and display load.
  • First-cycle calibration after install: After fitting, run the battery down until the laptop hibernates on low-battery cutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell and clears the inaccurate health warning that appears in the BIOS after a cell swap.

BIOS reporting poor battery health immediately after fitting the BTY-S11

The LUG N011 BIOS reads battery health from EEPROM data that is still tied to the old, degraded cell. When a new cell is fitted, the BIOS hasn't recalculated capacity against actual charge cycles, so it continues to report the old health status. Running one full discharge-to-hibernate followed by a complete uninterrupted charge resets the battery learn cycle. After two to three full cycles, the BIOS typically updates the health status to reflect the new cell's actual capacity.

LUG N011 shutting down suddenly with 20–30% charge still showing

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's voltage curve. The gauge underestimates how close the cell is to its lower voltage cutoff, so the laptop cuts power before the display hits 0%. The fix is a calibration cycle: let the laptop discharge fully under normal use until it hibernates, then charge straight to 100% without interruption. After two full cycles, the fuel gauge aligns with the actual cell voltage, and the shutdowns stop. Target a resting voltage of 12.6V at full charge to confirm the cell is performing correctly.

Compatible Models

Netbook LUG N011

Replaces Part Numbers

BTY-S11 TX2-RTL8187SE 6317A-RTL8187SE 14L-MS6837D1 3715A-MS6837D1

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight290g /10.23 oz
Gross Weight600g /21.16 oz
Approximate Weight600g /21.16 oz
Dimension 248.00 x 92.00 x 50.00mm

Product Highlights

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

Frequently Asked Questions

The LUG N011 BIOS still shows the old battery's Wh rating after I swapped in the BTY-S11 — is the new cell faulty?

The Wh figure shown in the BIOS comes from EEPROM data written by the original cell, not live measurements from the new one. The new BTY-S11 is rated at 48.84Wh, but the BIOS won't update that figure until it completes a battery learn cycle. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. After one or two full cycles, the BIOS recalculates and the displayed Wh figure updates to match the actual cell.

My LUG N011 charges the new battery to 80% then stops — the charge light goes off and it won't go higher.

Some LUG N011 firmware revisions include a BIOS-controlled charge limit that caps charging at 80% as a cell-longevity setting. This is a firmware behaviour, not a fault with the replacement cell. Check the BIOS power or battery settings menu for a "battery charge threshold" or "maximum charge" option and set it to 100%. If no such setting exists, update the BIOS to the latest version from the manufacturer, as early firmware on this platform had this limit active by default.

After three days of light use, the BTY-S11 in my LUG N011 drained far faster than expected — the OS fuel gauge jumped from 60% to 10% in minutes.

A newly installed Li-ion cell needs several calibration cycles before the fuel gauge IC can accurately map its voltage curve to a percentage reading. On the LUG N011, the gauge IC samples cell voltage against a model built on the old cell's data, so early readings are unreliable and the percentage can drop sharply at mid-range. Run two to three full discharge-to-hibernate and full-charge-to-100% cycles without interruption. The gauge stabilises once it has enough data points from the new cell — erratic percentage jumps should stop by the third cycle.

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