Lenovo L18C3PF1 IdeaPad L340 17 Replacement Battery 11.52V
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Lenovo L18C3PF1 IdeaPad L340 17 Replacement Battery 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.
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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 L18C3PF1 IdeaPad L340 17 Replacement Battery 11.52V - is backordered and will ship as soon as it is back in stock.
Voltage
11.52V
Amp
3850mAh
Lenovo IdeaPad L340 17 Gaming — 11.52V Li-Polymer Replacement Battery (L18C3PF1)
This is an 11.52V, 3850mAh (44.35Wh) lithium-polymer replacement battery for the Lenovo IdeaPad L340 series. It fits the L340 17 Gaming, L340-17IRH, L340 15 Gaming, and L340-15IRH, among others. OEM part numbers L18C3PF1, 5B10T04976, and SB10W67243 all cross-reference to this cell.
- L340 series compatibility: The L340 15 and L340 17 Gaming variants share the same 11.52V three-cell battery rail, connector pinout, and BMS handshake protocol — one cell fits both chassis sizes without modification.
- Bench tested on actual hardware: We ran this cell on an L340-17IRH and confirmed the BMS negotiated correctly, charge acceptance reached full capacity, and no fault codes appeared in Lenovo Vantage during the charge cycle.
- First-cycle recalibration on the L340: After installation, run the laptop down to hibernate-cutoff under normal load — gaming or sustained CPU use works well — then charge uninterrupted to 100%. 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.
Why the L340 Gaming BIOS reports poor battery health after a cell swap
The L340's BIOS stores learned capacity data from the previous cell in EEPROM. When a new cell goes in, the stored figures don't match the new chemistry, and the firmware flags a health warning. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learned values and clears the warning. Lenovo Vantage will show accurate health status once the learn cycle completes.
L340 shutting down at 20–30% charge shown on screen
This symptom means the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The percentage shown is based on old learned data, so the laptop hits the real low-voltage cutoff before the displayed number reaches zero. The fix is two to three full discharge-and-charge cycles under genuine load — use the GPU and display at full brightness to stress the cell. After calibration, the gauge tracks accurately and the BMS cutoff aligns with the displayed percentage near 5V per cell.
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
The Lenovo Vantage app is showing the new battery as "Unknown" or 0% health — is the cell faulty?
It is not faulty. The L340's BIOS reads health data from EEPROM values written by the previous cell, and a fresh cell has none of that history yet. Run the laptop down to hibernate under load, then charge uninterrupted to 100% — this triggers the BIOS battery learn cycle. After one full cycle, Vantage recalculates health against the new cell and the "Unknown" status clears.
My L340 shuts off suddenly under gaming load even though the battery shows 25% remaining — what is causing this?
Under full GPU and CPU load, the cell voltage drops sharply at low state of charge — this is a voltage cliff effect. The BMS hits its low-voltage cutoff before the fuel gauge catches up, so the laptop cuts out with charge still showing on screen. Run two to three full discharge-to-hibernate cycles under real gaming load to let the fuel gauge IC calibrate its voltage curve against the new cell. Once calibrated, the displayed percentage and the actual cutoff point align at roughly 3.0V per cell.
The system info page shows the wrong Wh rating for this battery — it says something different from 44.35Wh — should I be concerned?
No action needed in most cases. The Wh figure displayed in Windows Device Manager or Lenovo Vantage is read from the cell's EEPROM, and some replacement cells carry the manufacturer's rated chemistry value rather than the exact OEM figure. The actual capacity — what the cell delivers under charge — is 44.35Wh as specified. Confirm this by running a full charge cycle and checking the "Full Charge Capacity" value in Lenovo Vantage; it should read within 5% of 44,350mWh once calibration cycles are complete.
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