Advent 4211 Notebook Replacement Battery 11.1V 4400mAh
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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Advent 4211 Notebook Replacement Battery 11.1V 4400mAh - 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.
Advent 4211 Notebook Replacement Battery 11.1V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Advent 4211 / 4212 — 11.1V Li-ion Replacement Battery (BTY-S12)
This is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery that fits the Advent 4211 and 4212 notebook computers. It replaces OEM part BTY-S12 and restores unplugged operation when the original cell has degraded. Voltage and connector match the original specification.
- 4211 and 4212 platform fit: Both models share the same battery bay, connector pinout, and BMS communication protocol, which is why one cell covers both. The SMBus lines carry charge state and temperature data between the pack and the motherboard — the connector has to be exact for that handshake to work.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 4211 unit. The BMS negotiated correctly, charge current ramped through CC phase and tapered cleanly in CV, and the protection circuit tripped at the expected low-voltage cutoff without issue.
- Post-install calibration tip: After fitting this battery, run the laptop fully down until it hibernates on its own, then charge uninterrupted to 100% without using the machine. This gives the fuel gauge IC a full reference sweep against the new cell and clears the inaccurate health warning the BIOS displays after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The Advent 4211 stores battery health data in the EEPROM of the original pack. When a new cell goes in, the BIOS reads stale data from its own cached record and flags the battery as degraded before it has run a single cycle. This is not a fault with the replacement — it is a calibration state. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100%. After that cycle, the BIOS battery learn routine updates its reference and the health warning clears.
Laptop cuts out at 20–30% charge shown on the gauge
This happens when the fuel gauge IC has not yet mapped the new cell's discharge curve. The gauge still references the old cell's voltage-to-capacity profile, so it misjudges where the voltage cliff sits. Under combined CPU and display load, the actual cell voltage drops below the BMS cutoff threshold before the gauge reaches 0%. The fix is two to three full calibration cycles — discharge to hibernate cutoff, charge to 100% — after which the IC recalibrates its model. If shutdown still occurs below 15% after three cycles, check that AC adapter output holds steady at 19V under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Advent
- 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 Advent 4211 shows the new battery as "0% available (plugged in, charging)" and never moves — what's happening?
The OS fuel gauge IC is reading EEPROM data cached from the original pack and has not yet established a baseline for the new cell. This shows up as a stuck percentage or a false "0%" reading in Windows power settings. Run the laptop off AC power until it hibernates on its own, then charge uninterrupted to 100% without using the machine. After one complete cycle, the gauge IC recalibrates and the percentage tracking returns to normal.
The replacement battery shows a different Wh rating in Windows system info than the original — is something wrong with the cell?
No. The Wh figure shown in Windows is pulled from the EEPROM data the battery pack reports, and the rated value embedded in a new cell's firmware can differ slightly from what the original pack reported after years of use. The actual chemistry and usable capacity of this cell is 48.84Wh at 11.1V — that does not change. If the value in system info concerns you, cross-check it against the label on the cell itself rather than the original pack's reported figure.
Charge on the Advent 4212 stops climbing at around 80% and the status switches to "plugged in, not charging" — is the battery faulty?
This is almost always a BIOS-controlled charge threshold, not a cell fault. Many Advent and MSI-platform notebooks ship with a battery care mode enabled in firmware that caps charge at 80% to reduce cell stress during long periods on AC power. Go into the BIOS setup utility or the manufacturer's power management software and look for a "battery charge limit" or "battery care" setting. Disable it or set the threshold to 100%, then reconnect AC power and confirm charge resumes above 80%.
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