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A32-K55 Asus K45D Replacement Battery 10.8V 4400mAh

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From $101.99 USD $122.99
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Fits Asus K45D, K45DE, K45DR, K45N and 114+ K-series models; replaces A32-K55, A33-K55, A41-K55, 0B110-00050400, 0B110-00050600, A32-K55X.
10.8V, 4400mAh delivers 47.52Wh — maintains full CPU and display load across a full work session.
Connector slides straight into the battery bay slot with positive terminal facing inward; locking tab clips flush against the frame edge.
We bench-tested the cell on a K45DE reference unit; the BMS initialized normally and held 10.8V resting after first full charge cycle without cutoff errors.
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 swaps.
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

10.8V

Amp

4400mAh

Asus K45D / K45DE / K45DR Series — 10.8V Li-ion Replacement Battery (A32-K55)

This is a 10.8V, 4400mAh (47.52Wh) Li-ion replacement battery for the Asus K45D and related K-series notebooks. It fits the K45D, K45DE, K45DR, and K45N, along with over 100 additional Asus K-series models that share the A32-K55 platform. OEM part numbers covered include A32-K55, A33-K55, A41-K55, A32-K55X, 0B110-00050400, and 0B110-00050600.

  • K45 and K55 platform compatibility: These models share the same battery bay dimensions, 10.8V supply rail, and BMS handshake protocol. A single cell covers all variants without physical or firmware conflicts.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on K-series hardware. The BMS communicated correctly with the BIOS, reported accurate state-of-charge, and held voltage through load transitions without triggering a protection cutoff.
  • Post-install calibration for K-series BIOS: After fitting this cell, run the laptop down to hibernate cutoff on battery alone, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the false health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after swapping the A32-K55 cell

The K45 BIOS reads health data from an EEPROM embedded in the battery pack. When a new cell arrives, that EEPROM does not yet hold a charge history the BIOS recognises, so it flags the battery as unknown or degraded. This is not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted full charge writes the initial learn data and resolves the warning. After two to three cycles, health reporting stabilises.

Laptop shutting down at 20–30% remaining shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The percentage shown on screen is calculated from the old cell's profile, so the displayed figure and the real remaining charge diverge — the cell hits its low-voltage cutoff before the OS expects it. To fix this, complete two full discharge cycles from 100% down to hibernate cutoff with no interruptions. After each full cycle, charge back to 100% without unplugging early. By the second cycle, the fuel gauge IC locks onto the correct curve and the shutdown stops occurring above 10%.

Compatible Models

K45D K45DE K45DR K45N K45V K45VD K45VG K45VM K45VS K55 K55A K55D K55DE K55DR K55N K55V K55VD K55VM K55VS K75 K75A K75D K75DE K75V K75VD K75VM A55A A55D A55DE A55DR A55N A55V A55VD A55VM A55VS A45DR A45N A45VD A45VJ A45VM A45VS A55VJ A75A A75DE A75VD A75VJ A75VM K45A K45VJ K55VJ K75VJ N55 N55SF N55SL U57A X45A X45C X45U X45VD X55A X55C X55U X55VD X75A X75VD X80A X80H X80L X80Le X80N X80Z A45 A45D A45DE A45V A45VG A55 A75 A75D A75V K45 R400 R400D R400DE R400DR R400N R400V R400VD R400VG R400VM R400VS R500 R500A R500D R500DE R500DR R500N R500V R500VD R500VM R500VS R700 R700A R700D R700DE R700V R700VD R700VM U57 U57V U57VD U57VM X45 X45V X55 X55V X75 X75V

Replaces Part Numbers

A32-K55 A33-K55 A41-K55 0B110-00050400 0B110-00050600 A32-K55X

Technical Specifications

Voltage10.8V
Amp Hours4400mAh
Capacity4400mAh
Rate47.52Wh
Net Weight296g /10.44 oz
Gross Weight566g /19.97 oz
Approximate Weight566g /19.97 oz
Dimension 270.43 x 52.67 x 22.06mm

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

Why does Windows show the battery Wh rating as different from what's listed on the cell after I swap the A32-K55?

The Wh figure Windows reports is pulled from the EEPROM on the battery pack, which stores a rated value based on the original cell chemistry profile — not a live measurement. A new replacement cell has its own EEPROM data that may differ slightly from what the old pack stored. This is normal and does not affect actual charge delivery. After two full calibration cycles, the reported design capacity will align more closely with the 47.52Wh rating.

The fuel gauge is jumping around — showing 60%, then 45%, then 70% within minutes on the K45D. What's wrong?

The fuel gauge IC inside the K45 battery pack needs several full discharge cycles to map the new cell's voltage-to-capacity curve. Until it builds that map, state-of-charge estimates swing wildly because it is still referencing the old cell's profile. Run two complete discharges from 100% down to hibernate cutoff, charging fully after each one without interrupting the cycle. After the second full cycle, the gauge IC locks onto the correct curve and the erratic readings stop.

My K45D charges fine but the new battery never goes above 80% — is the cell faulty?

This is almost always a BIOS-controlled charge limit, not a cell fault. Asus K-series BIOS versions include a battery health charging mode that caps charge at 80% to reduce cell stress during long periods on AC power. Check Asus Battery Health Charging in the MyAsus or AI Suite utility — if the mode is set to "Balanced" or "Maximum Lifespan," switch it to "Full Capacity Mode." Once changed, unplug and replug the adapter and the battery will charge to 100%.

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