Lenovo IdeaPad S340-15IIL Replacement Battery 11.34V 4400mAh
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Lenovo IdeaPad S340-15IIL Replacement Battery 11.34V 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.
Lenovo IdeaPad S340-15IIL Replacement Battery 11.34V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.34V
Amp
4400mAh
Lenovo IdeaPad S340-15IIL — 11.34V Li-Polymer Replacement Battery (5B10T09095)
This 11.34V, 4400mAh (49.9Wh) Li-Polymer cell replaces the original battery in the Lenovo IdeaPad S340-15IIL (81WW) and a wide range of IdeaPad S340 and C340 variants. It matches the OEM voltage rail, connector pinout, and BMS communication protocol the IdeaPad S340 expects. Capacity figure is sourced from the physical cell — 4400mAh at 11.34V nominal.
- IdeaPad S340 and C340 series compatibility: These models share the same 11.34V three-cell Li-Polymer architecture, identical connector housing, and the same BMS handshake sequence over the SMBus line. A cell that works in the S340-15IIL will authenticate correctly in the S340-14IWL and C340-15IWL without modification.
- Bench tested on actual hardware: We seated this cell in an IdeaPad S340 chassis and cycled it through full charge and discharge under sustained CPU and display load. The BMS held charge termination at the correct cutoff voltage and passed authentication on every boot — no unknown device errors during testing.
- Post-installation calibration — IdeaPad S340 specific: After fitting, run the battery down until the laptop hibernates, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor after IdeaPad S340 cell swap
When you replace the cell in an IdeaPad S340, the BIOS reads EEPROM data carried over from the old battery — cycle count, wear percentage, and capacity history. That stored data makes a fresh cell appear degraded. The fix is not a firmware update. Run the new cell through one full discharge-to-hibernate cycle followed by a full uninterrupted charge to 100%. After that cycle, the BIOS resets the learn counters and the health warning clears.
IdeaPad S340 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The IC is still using the old cell's discharge profile, so it misreads the remaining capacity and triggers a shutdown well before the cell is empty. It is not a faulty battery. Run two to three full discharge-and-charge cycles — by the third cycle, the fuel gauge IC has enough data to track the new cell accurately. After calibration, shutdowns at false low-percentage readings stop.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Lenovo
- 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
Why does Windows show my new IdeaPad S340 battery as 0% or "unknown" right after I install it?
The fuel gauge IC in the S340 is reading EEPROM data from the old cell and cannot yet map it to the new cell's voltage curve. It reports 0% or "unknown" until it gets real discharge data. Run the laptop on battery until it hibernates, then charge to 100% without interrupting. After that first full cycle, the OS gauge updates and displays an accurate state of charge.
My IdeaPad S340 replacement battery stopped charging at 80% — is the cell faulty?
No. Lenovo's BIOS includes a charge threshold setting that caps charging at 80% to reduce long-term cell wear — it ships enabled on many IdeaPad units. Open Lenovo Vantage, go to Power, then Battery Settings, and check whether "Conservation Mode" or a custom charge threshold is active. Disable it or set the upper limit to 100%, then reconnect the charger. The battery will charge to full immediately.
System Information shows the wrong Wh rating for my new S340 battery — it says something different from 49.9Wh. Is something wrong?
The Wh value Windows or Lenovo Vantage displays is pulled from the cell's EEPROM, which stores the rated capacity at the time of manufacture. The physical cell in this battery delivers 49.9Wh under our bench test conditions, but the EEPROM value may differ slightly due to rounding or chemistry batch variance. If the cell charges fully, calibrates correctly after two cycles, and does not cut off early under load, the Wh display discrepancy is cosmetic — check actual discharge behaviour, not the reported number.
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