Asus UX360UA Replacement Battery 11.55V 4800mAh C31N1538
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.
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Asus UX360UA Replacement Battery 11.55V 4800mAh C31N1538 - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Asus UX360UA Replacement Battery 11.55V 4800mAh C31N1538 - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
4800mAh
Asus UX360UA / Q324UA Series — 11.55V Li-Polymer Replacement Battery (C31N1538)
This 11.55V, 4800mAh (55.44Wh) Li-Polymer cell is a direct swap for the internal battery in the Asus UX360UA and Q324UA convertible ultrabooks. It replaces OEM part numbers C31N1538, 0B200-02080000, and C31Pq9H. When the original cell degrades and the laptop loses portability, this restores full off-charger operation.
- UX360UA and Q324UA platform fit: Both models share the same 11.55V three-cell architecture, slim 3.68mm cell profile, and connector pinout — which is why one SKU covers the full range including UX360UA-1A, UX360UA-1C, and 64 additional variants.
- Bench tested on actual hardware: We seated this cell in a UX360UA chassis, confirmed BMS handshake under Windows, and cycled charge through the full range. The protection circuit held cutoff correctly at both ends without tripping during normal display-plus-CPU load.
- Post-install calibration on the UX360UA: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or capacity warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The UX360UA BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's reported values. When those don't match, it flags the battery as degraded before a single charge cycle runs. This is a firmware interpretation issue, not a fault with the replacement cell. Running one full discharge-to-hibernate then a complete charge cycle forces the BIOS to write fresh learn-cycle data and clear the warning.
Laptop shuts down at 20–30% shown on the fuel gauge
The fuel gauge IC on the UX360UA board calibrates its empty-point estimate against charge history from the previous cell. After a swap, it can map the wrong voltage as the cutoff floor, causing an early shutdown well before true depletion. Under combined CPU and display load, the new cell's voltage curve also drops faster than the IC expects during the first few cycles. Discharge fully to hibernate cutoff twice, letting the IC re-map the real voltage cliff — typically around 9.0V at the cell terminals under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Asus
- 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 UX360UA shows the new battery as "0% available (plugged in, not charging)" right after installation — what's happening?
The BIOS has EEPROM data from the old cell and hasn't accepted the new cell's identity yet. Disconnect the AC adapter, hold the power button for 15 seconds to drain residual board power, then reconnect and boot. If the gauge still reads 0%, enter the BIOS, let it sit on the battery info screen for 30 seconds, then save and exit — this forces a fresh BMS handshake on most UX360UA firmware revisions.
The fuel gauge on my UX360UA is jumping around wildly — showing 60%, then 45%, then 70% within minutes of each other. Is the replacement cell faulty?
The fuel gauge IC hasn't calibrated against the new cell's actual discharge curve yet. It's interpolating from old charge-history data that no longer matches the cell in the chassis. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100% — the IC re-maps its voltage-to-capacity table across each cycle and the readings stabilise, typically within three full cycles.
Windows reports this battery's capacity as around 38Wh in the battery report, but the product lists 55.44Wh — which is correct?
The Windows battery report pulls the Design Capacity value from the EEPROM embedded in the old cell's data, which can persist until the BIOS learn cycle overwrites it. The physical cell is rated at 55.44Wh — that is the authoritative figure from the cell chemistry, not the EEPROM legacy value. Run a full discharge-to-hibernate then charge to 100%, then generate a fresh battery report using `powercfg /batteryreport` — the Design Capacity figure should update to reflect the new cell.
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