Asus VivoBook S15 S530UA Replacement Battery B31N1729 11.52V
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Asus VivoBook S15 S530UA Replacement Battery B31N1729 11.52V - 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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Asus VivoBook S15 S530UA Replacement Battery B31N1729 11.52V - is backordered and will ship as soon as it is back in stock.
Voltage
11.52V
Amp
3550mAh
Asus VivoBook S15 S530UA — 11.52V Li-ion Replacement Battery (B31N1729)
This is an 11.52V, 3550mAh (40.9Wh) Li-ion battery for the Asus VivoBook S15 S530UA and related S530 series laptops. It replaces OEM part numbers B31N1729 and 0B200-02920000. Fit covers the S530UA, S530UN, S5300UN, and over 150 additional S530 variants sharing this cell format.
- S530 series compatibility: The S530 line — UA, UN, UB, FA variants — shares a common battery bay geometry and BMS handshake protocol. All of them draw from the same 11.52V three-cell rail with an identical connector footprint, which is why one part number covers the entire range.
- Bench tested on actual hardware: We cycled this cell on an S530UA unit and monitored BMS communication throughout. The protection circuit engaged correctly at the low-voltage cutoff threshold, and charge acceptance from a depleted state held steady across three consecutive cycles.
- Post-swap calibration on the S530UA: After installing, run the laptop down to hibernate-level cutoff on battery alone — no AC — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health or capacity warning that commonly appears after any cell swap on this platform.
Why the S530UA BIOS flags a new battery as poor health
The S530UA stores battery health data in EEPROM on the old cell. When a new cell is fitted, the BIOS reads no matching history and flags the battery as degraded or unknown. This is a data mismatch, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by a complete charge resets the learn cycle. After two to three cycles the health reading normalises and the warning clears.
Laptop shutting down at 20–30% remaining after battery swap
This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. The S530 platform uses a coulomb counter that loses accuracy when cell chemistry or capacity changes. Under full load — CPU boost plus display brightness — the actual cell voltage can drop faster than the OS estimate, triggering an emergency shutdown before the gauge reaches zero. Run two full discharge-to-hibernate cycles without interruption and the fuel gauge IC will re-anchor to the new cell's actual voltage floor, typically around 10.4V at cutoff.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 S530UA BIOS still shows 0% or "unknown" battery two days after fitting this replacement — what's wrong?
The BIOS pulled health and charge data from the EEPROM on your original cell, and the new cell has no matching record. This is not a fault with the replacement. Discharge the laptop fully on battery alone until it hibernates, then charge without interruption to 100%. That single learn cycle writes fresh baseline data and clears the unknown status — repeat once more if the reading hasn't normalised.
Windows battery report shows this cell as 40.9Wh but the system info panel displays a different Wh figure — which is correct?
The system info panel reads the EEPROM-rated value stored by the original OEM cell, which may differ from the actual chemistry specification of the replacement. The 40.9Wh figure in the battery report reflects measured capacity against the real 11.52V, 3550mAh cell — that number is accurate. The panel discrepancy is an EEPROM data artefact and does not affect charge behaviour or output.
Charge stops at 80% and the S530UA won't charge beyond that — is the new battery faulty?
No — this is a BIOS-controlled charge limit, not a cell fault. Asus laptops ship with a battery health charging mode that caps charge at 80% to reduce long-term cell wear. Check MyASUS app or the BIOS under Power settings for "Battery Health Charging" and either disable it or switch to Full Capacity Mode. Once that setting is off, the battery will charge to 100%.
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