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Lenovo IdeaPad S10-2 Compatible Battery 11.1V 4400mAh L09C3B12

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Fits Lenovo IdeaPad S10-2 netbook; replaces L09C3B12, L09C6Y12, L09C6YU11, L09M3B11, 55Y9382, 55Y9383, L09C3B11, 57Y6273, 57Y6275, L09S6Y11.
11.1V 4400mAh Li-ion cell delivers 48.84Wh to the S10-2's integrated charger circuit without step-down regulation.
Connector slides straight into the battery slot under the keyboard; locking tab seats flush when pushed home.
Bench testing showed BMS accepting charge handshake on first insertion; fuel gauge IC calibrated after one full discharge cycle.
After install, run one complete discharge to hibernation cutoff then charge uninterrupted to 100% — this resets BIOS battery learn cycle and clears the inaccurate health warning that Lenovo firmware displays 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.

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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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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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

11.1V

Amp

4400mAh

Lenovo IdeaPad S10-2 Series — 11.1V Li-ion Replacement Battery (L09C3B12)

This is an 11.1V 4400mAh (48.84Wh) Li-ion replacement battery for the Lenovo IdeaPad S10-2 netbook. It fits the S10-2, S10-2 20027, and S10-2 2957 variants. OEM part numbers covered include L09C3B12, L09C6Y12, L09M3B11, 55Y9382, 55Y9383, and several others listed in the compatibility table.

  • S10-2 variant compatibility: The 20027 and 2957 sub-models share the same 11.1V three-cell architecture, connector pinout, and BMS handshake protocol — which is why a single cell covers all three board revisions without modification.
  • Bench tested on actual hardware: We cycled this cell on the S10-2 platform and confirmed the BMS negotiates correctly at initial power-on, charge current ramps normally from the AC adapter, and the protection circuit trips at expected low-voltage cutoff without false disconnects.
  • Post-install calibration on the S10-2: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the IdeaPad S10-2 shuts down at 20–30% after a battery swap

The S10-2 BIOS tracks a discharge curve learned from the previous cell. After a swap, it applies the old curve to a new cell — and those curves don't match. Under combined CPU and display load, the new cell's voltage drops faster than the stored curve predicts, triggering a false low-voltage shutdown well above actual empty. Running two to three full discharge-to-recharge cycles overwrites the stored curve. Once calibrated, the BIOS reads the new cell accurately and shutdowns at 20–30% stop occurring.

BIOS reporting 0% or "unknown" battery immediately after installation

The IdeaPad S10-2 reads battery identity and state-of-charge from EEPROM data embedded in the battery pack. A freshly installed cell has no discharge history in that register, so the BIOS fuel gauge IC has no reference point and reports 0% or flags the battery as unknown. This is not a fault with the cell itself. Plug in the AC adapter, let the battery charge to 100% without interruption, then allow a full discharge to hibernate — after that first cycle the fuel gauge IC maps the new cell correctly and the percentage reading stabilises.

Compatible Models

ideapad S10-2 IdeaPad S10-2 20027 IdeaPad S10-2 2957

Replaces Part Numbers

L09C3B12 L09C6Y12 L09C6YU11 L09M3B11 55Y9382 55Y9383 L09C3B11 57Y6273 57Y6275 L09S6Y11

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight313.7g /11.07 oz
Gross Weight493.7g /17.41 oz
Approximate Weight493.7g /17.41 oz
Dimension 225.97 x 43.83 x 29.84mm

Product Highlights

  • Brand: Lenovo
  • 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

My S10-2 shows the new battery at full charge in Windows but the laptop still dies suddenly — what's happening?

The Windows fuel gauge is reading the EEPROM estimate, not live cell voltage — and the two are out of sync after a cell swap. Under CPU and display load, the actual cell voltage hits the BMS low-voltage cutoff before the OS registers a low-battery warning. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%. After that, the fuel gauge IC recalibrates against the real discharge curve and the sudden shutdowns stop.

Why does the IdeaPad S10-2 BIOS show a different Wh rating than what the battery lists on the label?

The Wh figure the BIOS displays is pulled from the EEPROM register on the old cell — it doesn't update automatically on swap. The new cell's rated 48.84Wh is correct per the chemistry and cell count, but the BIOS may display a stale or rounded value until a full calibration cycle is complete. Run one full discharge to hibernate cutoff and one uninterrupted charge to 100%. After that cycle the BIOS reads the new EEPROM data and the Wh figure aligns with the cell's actual rated capacity.

The charge light on the S10-2 stops blinking and the battery sits at 80% — is the cell faulty or is this a firmware limit?

The S10-2 BIOS includes a charge-limit threshold that some firmware versions enforce at 80% when battery health data looks degraded or mismatched. This is a firmware decision, not a cell fault. Enter the BIOS setup (F2 at boot), check for a battery conservation or charge-threshold setting, and disable it. If no such setting is present, perform a full discharge-to-hibernate cycle — this clears the degraded-health flag and the charger resumes to 100%.

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