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Asus Eee PC 1201N Replacement Battery 11.1V 4400mAh A32-UL20

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From $91.99 USD $109.99
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Fits Asus Eee PC 1201N, 1201T, 1201, 1201HA netbooks; replaces OEM part A32-UL20 and equivalent Asus part numbers.
11.1V 4400mAh capacity delivers full charge cycles on this single-core Intel Atom platform without voltage sag.
Connector slides straight into the battery slot with no rotation needed; locking tab engages on insertion and holds firm.
We cycled this cell in a 1201N from full charge through idle and light load; the BMS accepted the pack without fault codes.
After installation, run one full discharge to auto-shutoff 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 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

11.1V

Amp

4400mAh

Asus Eee PC 1201N Series — 11.1V Li-ion Replacement Battery (A32-UL20)

This is an 11.1V, 4400mAh (48.84Wh) Li-ion replacement battery for the Asus Eee PC 1201N and related UL20 series netbooks. It replaces OEM part numbers A32-UL20 and A31-UL20, and fits a broad range of 1201 and UL20A variants. Install it when the original cell no longer holds a charge or the system shuts down unexpectedly under load.

  • Eee PC 1201 and UL20A platform fit: These models share the same 11.1V three-cell battery rail, connector pinout, and BMS handshake protocol. The same physical pack and EEPROM data signature works across the 1201N, 1201T, 1201HA, and UL20A without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an Eee PC 1201N. The BMS communicated correctly with the BIOS, reported charge state accurately after calibration, and held voltage without tripping the protection circuit under sustained CPU and display load.
  • First-cycle learn reset on the 1201N: After installation, run the battery down until the system hibernates, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The Eee PC 1201N BIOS stores learned capacity data from the previous cell in firmware. When a new cell goes in, the BIOS compares live readings against that stale data and flags a health warning — not because the new cell is faulty, but because the reference values no longer match. Run one complete discharge to hibernate-cutoff followed by an uninterrupted charge to 100%. After one or two full cycles, the BIOS recalculates against the new cell's actual chemistry and the warning clears.

Eee PC 1201N shutting down at 20–30% charge shown

This happens when the cell cannot sustain the voltage the BIOS expects under combined CPU and display load. As the cell discharges toward the lower end, voltage sags below the firmware cutoff threshold before the fuel gauge reaches zero — so the system shuts down while the OS still shows charge remaining. It is a voltage cliff, not a capacity fault. Recalibrate by draining the battery fully to hibernate, then charging to 100% without interruption — this resets the fuel gauge IC baseline to match actual cell voltage at each state of charge.

Compatible Models

Eee PC 1201N Eee PC 1201T Eee PC 1201 Eee PC 1201HA UL20A UL20G UL20VT 1201N-SIV018M Eee PC 1201 Eee PC 1201K Eee PC 1201NL Eee PC 1201PN Eee PC 1201T Pro23 Pro23A UL20 UL20FT EPC 1201N Eee PC 1201N-PU17-SL X23FT Eee PC 1201N-PU17-BK UL20GU EPC 1201N-SIV047M X23F UL20A-A1 X23A X23 UL20F Eee 1201NL Eee 1201PN Eee 1201T Eee 1201N Eee 1201HA Eee 1201

Replaces Part Numbers

A32-UL20 9COAAS186459 UL2LA21 90-NX62B2000Y 07GO16EE1875M-00A20-949-114F 07G016CH1875 07G016CJ1875 07G016D31875 07G016D61875 07G016D81875 07G016EB1875 07G016FG1875 07G016HA1875 70-NX61B3000Z 70-NZE1B2000Z 70-NZH4B2000Z 70-OA1S1B2000 70-OA1Y1B1100 70-OA1Y1B3000 70-OA2G1B3000 9COAAS031219 A31-UL20

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight321g /11.32 oz
Gross Weight471g /16.61 oz
Approximate Weight471g /16.61 oz
Dimension 206.10 x 47.80 x 23.30mm

Product Highlights

  • Brand: Asus
  • 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 Eee PC 1201N shows the new battery as "0% available (plugged in, charging)" and never moves — what's happening?

The fuel gauge IC on the 1201N reads EEPROM data from the previous cell to calculate charge state. With a fresh cell, that reference is mismatched and the gauge stalls at 0% or reports an unknown state. Run the laptop down to hibernate-cutoff on battery only, then charge uninterrupted to 100%. After one full cycle the IC recalibrates against the new cell and the percentage tracks correctly.

My replacement A32-UL20 battery shows 48Wh in the BIOS spec screen but Windows reports only 38Wh — which is right?

The BIOS pulls the rated Wh figure stored in the battery's EEPROM, while Windows reads the fuel gauge IC's calculated value based on current cell chemistry and learned capacity. These figures diverge on a new cell before calibration cycles have run. The EEPROM-rated 48.84Wh is the correct nominal spec for this pack. Run two full discharge-to-hibernate and charge-to-100% cycles and the Windows figure will converge toward the rated value.

Charging stops at around 80% and won't go higher — is the replacement cell defective?

On the Eee PC 1201N, a BIOS firmware charge-limit setting can cap charging at 80% to reduce long-term cell stress — this is a BIOS control, not a fault with the replacement cell. Enter the BIOS setup (F2 at boot), locate the Battery Health Charging or Power Management section, and set the charge threshold to 100%. If no such setting exists, run a forced recalibration cycle: discharge fully to hibernate, then charge uninterrupted — this clears a misread charge-limit triggered by stale firmware data from the old cell.

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