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Lenovo B40 14.8V Replacement Battery L13L4A01 2200mAh

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New arrival
From $100.99 USD $121.99
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Fits Lenovo B40, B40-30, B40-45, B40-70 laptops; replaces L13L4A01, 45N1185, L12L4E55, L13M4A01, 45N1184, 45N1183, L12S4E55, L13S4A01 batteries.
14.8V at 2200mAh delivers 32.56Wh; adequate for standard office and browsing workloads on this ultraportable frame.
Connector slides in straight; small retention clip locks firmly into the B40 battery bay slot without forcing.
Bench testing showed normal BMS curve on first charge cycle; cell accepted full voltage ramp and delivered rated capacity.
After installation, discharge fully to system shutdown then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warnings that appear after every cell swap on Lenovo platforms.
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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.

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: 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.

Voltage

14.8V

Amp

2200mAh

Lenovo B40 Series — 14.8V Li-ion Replacement Battery (L13L4A01)

This is a 14.8V, 2200mAh (32.56Wh) Li-ion replacement battery for the Lenovo B40 notebook laptop. It fits the B40-30, B40-45, and B40-70 among others. Install it when the original cell no longer holds a charge or the laptop can't run away from the wall outlet.

  • B40 series compatibility: The B40-30, B40-45, and B40-70 all share the same 14.8V four-cell battery rail, connector pinout, and BMS handshake protocol. That's why one cell covers this entire family — the EEPROM profile and communication bus are identical across variants.
  • Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication handshake on B40-series hardware. The EEPROM data loaded correctly, charge current responded as expected, and the protection circuit tripped at the correct low-voltage threshold.
  • First-cycle calibration after install: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Lenovo systems.

BIOS reporting battery health as poor immediately after replacement

Lenovo's BIOS reads health data stored in the battery's EEPROM, not the live cell voltage. When a new cell goes in, the EEPROM cycle count and capacity registers don't match what the BIOS expects from a "healthy" pack. The system flags the mismatch as degraded health even though the cell is new. One full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the BIOS rewrite its baseline values against the new cell's actual parameters.

Laptop shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC still has calibration data from the old, worn cell. The percentage shown on screen is calculated against the old cell's known capacity curve, so it loses sync with the new cell's actual voltage. Under full CPU and display load, the new cell hits a voltage point the system treats as empty — even though the gauge still shows 20–30%. Two or three full discharge-and-charge cycles recalibrates the IC against the new cell. After calibration, the gauge should read accurately down to approximately 11.1V before the system hibernates.

Compatible Models

B40 B40-30 B40-45 B40-70 B50 B50-30 B50-30 Touch B50-45 B50-70 Eraser B40 Eraser B40-30 Eraser B40-45 Eraser B40-70 Eraser B50 Eraser B50-30 Eraser B50-30 Touch Eraser B50-45 Eraser B50-70 Eraser M4400 Eraser M4400A Eraser M4450 Eraser M4450A Eraser N40 Eraser N40-30 Eraser N40-45 Eraser N40-70 Eraser N50 Eraser N50-30 Eraser N50-45 Eraser N50-70 IdeaPad B40 IdeaPad B40-30 IdeaPad B40-45 IdeaPad B40-70 IdeaPad B50 IdeaPad B50-30 IdeaPad B50-30 Touch IdeaPad B50-45 IdeaPad B50-70 IdeaPad M4400 IdeaPad M4400A IdeaPad M4450 IdeaPad M4450A IdeaPad N40 IdeaPad N40-30 IdeaPad N40-45 IdeaPad N40-70 IdeaPad N50 IdeaPad N50-30 IdeaPad N50-45 IdeaPad N50-70 IdeaPad V4400 IdeaPad V4400A M4400 M4400A M4450 M4450A N40 N40-30 N40-45 N40-70 N50 N50-30 N50-45 N50-70 V4400 V4400A

Replaces Part Numbers

L13L4A01 45N1185 L12L4E55 L13M4A01 45N1184 45N1183 ASM 45N1182 FRU 45N1183 L12S4E55 L13S4A01

Technical Specifications

Voltage14.8V
Amp Hours2200mAh
Capacity2200mAh
Rate32.56Wh
Net Weight211g /7.44 oz
Gross Weight481g /16.97 oz
Approximate Weight481g /16.97 oz
Dimension 270.00 x 33.85 x 23.20mm

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

Windows shows the Lenovo B40 battery as 0% and won't charge after I put in the new cell — what's happening?

The fuel gauge IC is still locked to the old cell's EEPROM data and can't reconcile it with the new cell's voltage. Plug in the charger and leave it connected for at least 30 minutes without pressing the power button — the BMS needs time to initialise communication with the BIOS. If the gauge still reads 0%, do a hard shutdown, remove the AC adapter for 60 seconds, reconnect, and boot while plugged in. The charge circuit should pick up and begin climbing from there.

The B40 battery info screen shows the wrong Wh rating — it says 28Wh but the replacement is 32.56Wh. Is something wrong with the cell?

Nothing is wrong. The Wh value displayed in Windows or Lenovo Vantage is pulled from the EEPROM's design-capacity register, which reflects the original factory cell's rated figure — not the physical cell now installed. The actual charge going into and out of the new 32.56Wh cell is correct; the display figure is a reporting artefact. After two full charge-discharge cycles, the fuel gauge IC recalculates full-charge capacity against the new cell and the displayed value will update to match.

The B40 stops charging at exactly 80% every time — is this a fault with the replacement battery?

This is a BIOS-controlled charge limit, not a battery fault. Lenovo systems running Conservation Mode in the Lenovo Vantage app or Energy Manager cap charging at 80% to reduce long-term cell stress. Open Lenovo Vantage, go to Power, find Battery Charge Threshold or Conservation Mode, and switch it off. The battery will then charge to 100% on the next cycle.

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