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Lenovo ThinkPad T440 Replacement Battery 45N1134 11.1V

Up to 17% off
New arrival
From $109.99 USD $130.99
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Fits Lenovo ThinkPad T440, T440S, X240, X240S and replaces OEM part numbers 45N1134, 45N1737, 45N1135, 45N1132, 45N1125, 45N1126, 45N1124, 45N1127, 45N1128, 45N1129, 45N1130, 45N1131, 45N1133, 45N1137, 45N1160, 45N1734, 45N1735, 45N1736, 45N1738, 45N1767, 45N1777.
11.1V 4400mAh Li-ion cell delivers 48.84Wh — sufficient voltage and capacity to sustain the T440 CPU, display, and chipset under full load without early thermal throttle.
Connector tab slides into the battery slot underneath the palmrest; locking tab clicks and holds the cell flush with the chassis edge.
We bench-tested the cell under sustained CPU load and observed stable voltage delivery with clean BMS handshake to the motherboard; fuel gauge IC registered capacity correctly after two full charge cycles.
On first installation, run one full discharge cycle until the laptop hibernates, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the false poor-health warning that appears after cell replacement.
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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

11.1V

Amp

4400mAh

Lenovo ThinkPad T440 / X240 Series — 11.1V Li-ion Replacement Battery (45N1134)

This is an 11.1V, 4400mAh (48.84Wh) Li-ion cell for the Lenovo ThinkPad T440, T440S, X240, X240S, and over 160 additional ThinkPad models sharing the same battery bay and connector. It replaces OEM part numbers 45N1134, 45N1737, 45N1135, and the full 45N11xx family. Install it when the original cell no longer holds charge or the system refuses to leave AC power.

  • T440 and X240 platform compatibility: These models share a common 11.1V three-cell architecture, the same bottom-bay latch connector, and an identical BMS handshake protocol. That shared electrical spec is why one cell covers both the T440 and X240 chassis lines without firmware conflict.
  • Bench tested on actual hardware: We ran this cell on a T440 and X240S unit. The BMS initialised cleanly, charge current stepped correctly through CC and CV phases, and the protection circuit tripped at the expected over-discharge threshold without requiring a manual reset.
  • BIOS learn cycle after install: After fitting this cell, run the laptop down to hibernate cutoff on battery alone, then charge uninterrupted to 100%. This forces the ThinkPad BIOS to complete its battery learn cycle against the new cell and clears the false "poor health" warning that appears after every cell swap.

BIOS reporting battery health as poor immediately after replacement

The ThinkPad BIOS stores learned capacity data from the previous cell in its battery EEPROM. When a new cell goes in, the BIOS compares current readings against that stale data and flags a health warning — even when the replacement cell is fully functional. This is not a fault with the cell itself. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%. The BIOS resets its learned parameters against the new chemistry after that cycle completes.

Laptop shutting down at 20–30% remaining on the gauge

This happens when the fuel gauge IC still holds calibration data from the degraded original cell. The displayed percentage is calculated against old capacity baselines, so the gauge reads 25% while the actual cell voltage has already hit the BMS cutoff threshold. The cell is not faulty — the gauge IC needs two or three full discharge and charge cycles to recalibrate against the new cell's actual voltage curve. After those cycles, the cutoff should align with readings below 5%. If the shutdown persists past three cycles, check that the cell voltage at shutdown reads above 9V with a meter on the battery terminals.

Compatible Models

ThinkPad T440 ThinkPad T440S ThinkPad X240 ThinkPad X240S ThinkPad X250 ThinkPad S440 ThinkPad S540 ThinkPad T450(20BVA02RCD) ThinkPad T440 7000 ThinkPad X250(20CLA2EWCD) ThinkPad X250(20CLS2FD06) ThinkPad W550s 20E2000 ThinkPad T450s(20BXA03CCD) ThinkPad L450(20DSA078CD) ThinkPad X250 20CL001 T460P-0NCD ThinkPad X240(20AMA4K4CD) ThinkPad T440 20B7004 ThinkPad X260(20F6A08PCD) ThinkPad X240(20ALA0E4CD) ThinkPad X270 20K6000 ThinkPad T560(20FH001EGE) ThinkPad X240(20ALS00T00) ThinkPad T460(20FNA02DCD) ThinkPad X240(20ALS00P00) ThinkPad T460(20FNA027CD) ThinkPad T450(20BVA013CD) ThinkPad T470p(20J6A018CD) ThinkPad T440s(20AQ0024CD) ThinkPad X260(20F6A000CD) ThinkPad L450 20DS0005 ThinkPad T550(20CKA00UCD) ThinkPad X250(20CLA07NCD) ThinkPad T450s 20BW000 ThinkPad X250(20CLA08LCD) ThinkPad T450s(20BXA00UCD) ThinkPad L450(20DSA065CD) ThinkPad T440 20B6002 ThinkPad T460P(20FWA00NCD) ThinkPad X240(20AMA2VLCD) ThinkPad X270 20HN001 Thinkpad T550(20CK0002GE) ThinkPad X240(20AMS0GY00) ThinkPad T460(20FNA01XCD) ThinkPad X240(20ALA0CSCD) ThinkPad T460(20FNA06FCD) ThinkPad X240(20AM001LCD) ThinkPad X260(20F6A09KCD) ThinkPad T440s(20AR0017CD) ThinkPad T550 20CJ ThinkPad T440s(20AQ0031CD) ThinkPad T450(20BVA03PCD) ThinkPad T450(20BVA01GCD) ThinkPad T440s 20AR000 ThinkPad X250(20CLA1VFCD) ThinkPad T450(20BV0033CD) ThinkPad X240 20AK ThinkPad T450s(20BX002TCD) ThinkPad L450(20DSA02JCD) ThinkPad X250 20CL00A T460P-0VCD ThinkPad X240(20AMS5AB01) ThinkPad T440 20B7006 ThinkPad X260(20F6A085CD) ThinkPad X240(20ALA0H4CD) ThinkPad T560(20FJ0023GE) ThinkPad X240(20ALA0EYCD) ThinkPad T460(20FNA028CD) ThinkPad X240(20AL0020CD) ThinkPad T460(20FNA04DCD) ThinkPad T440s(20ARS1Y002) ThinkPad L470(20J4/20J5) ThinkPad T440s(20AQ0023CD) ThinkPad X260(20F6A002CD) ThinkPad L450 20DT0000 ThinkPad X250(20CLA2EXCD) ThinkPad X250(20CLA01WCD) ThinkPad T450s 20BX00 ThinkPad X250(20CLA1VGCD) ThinkPad T450(20BVA01HCD) ThinkPad X240 20AM004 ThinkPad X240(20AMS29X03) ThinkPad T440 20B6006 ThinkPad T460P(20FWA00VCD) ThinkPad X240(20ALS03X00) ThinkPad X270 20HN003 ThinkPad T550(20CK000VGE) ThinkPad X240(20ALA0GVCD) ThinkPad T460(20FNA020CD) ThinkPad X240(20ALA0CQCD) ThinkPad T460(20FNA024CD) ThinkPad X240(20AMS0KG00) ThinkPad T470p(20J6A012CD) ThinkPad T440s(20ARA0QHCD) ThinkPad T460p 20FW000 ThinkPad T450(20BVA02NCD) ThinkPad T450(20BVA02PCD) ThinkPad X250(20CLA01VCD) ThinkPad T440s 20AR0040 ThinkPad X250(20CLA275CD) ThinkPad T450(20BVA016CD) ThinkPad X240 20AL001 ThinkPad T450s(20BXA00RCD) ThinkPad L450(20DSA063CD) ThinkPad X250 20CM001 T460P-0JCD ThinkPad X240(20AMA53BCD) ThinkPad T440 7003 K21-80-ISE ThinkPad X240(20ALA0GWCD) ThinkPad X240(20ALS00A00) ThinkPad T460(20FNA03YCD) ThinkPad T550(20CKA00HCD) ThinkPad T460(20FM0034UK) ThinkPad T440s(20ARS152001) ThinkPad L470(20J4000WGE) ThinkPad T440s(20AQ0026CD) ThinkPad T450-3LCD ThinkPad T440 20B6 ThinkPad X250(20CLA262CD) ThinkPad X250(20CLA01XCD) ThinkPad T560 20FH002 ThinkPad X250(20CLA108CD) ThinkPad T450(20BVA01KCD) ThinkPad X240 20AM006 T460P-0TCD ThinkPad X240(20ALS03300) ThinkPad T440 20B6008 ThinkPad T460P(20FWA00JCD) ThinkPad X240(20AMA4DJCD) ThinkPad X270 20HN005 ThinkPad T550(20CK003FGE) ThinkPad X240(20ALS00D00) ThinkPad T460(20FNA01VCD) ThinkPad X240(20ALA0CRCD) ThinkPad T460(20FNA026CD) ThinkPad T440s(20AQA09HCD) ThinkPad T460 20FN002 ThinkPad X260(20F6000NCD) ThinkPad T450(20BVA02QCD) ThinkPad T450(20BVA03KCD) ThinkPad X250(20CLA06BCD) ThinkPad T450 20BV ThinkPad X250(20CLA278CD) ThinkPad T450(20BVA014CD) ThinkPad X240 20AL009 ThinkPad T450s(20BXA011CD) ThinkPad L450(20DSA01YCD) ThinkPad X250 20CM004 ThinkPad T460P(20FWA00TCD) ThinkPad X240(20AMA4W1CD) ThinkPad X240 20AL00B K21-80-IFI ThinkPad X240(20AMS3K319) ThinkPad T460(20FNA03ECD) ThinkPad X240(20AL001HCD) ThinkPad T460(20FNA036CD) ThinkPad T550(20CKA00ECD) ThinkPad T460(20FN003NGE) ThinkPad T440s(20AR001JCD) ThinkPad T550 20CK0000 ThinkPad T440s(20AQS01100) ThinkPad T450(20BVA00TCD) ThinkPad T450(20BVA03MCD) ThinkPad T440 6005 ThinkPad X250(20CLA260CD) ThinkPad L460

Replaces Part Numbers

45N1134 45N1737 45N1135 45N1132 45N1125 45N1126 45N1124 ASM P/N 45N1124 FRU P/N 45N1125 ASM P/N 45N1126 FRU P/N 45N1127 ASM P/N 45N1128 FRU P/N 45N1134 ASM P/N 45N1132 FRU P/N 45N1133 LC P/N 121500146 LC P/N 121500147 LC P/N 121500152 45N1136 00HW033 00HW034 0C52861 0C52862 121500146 121500147 121500148 121500152 121500212 121500213 121500214 3icp7/38/65 45N1127 45N1128 45N1129 45N1130 45N1131 45N1133 45N1137 45N1160 45N1734 45N1735 45N1736 45N1738 45N1767 45N1777 5B10G09007 5B10G10726 L12L3P53 L12M6Z53 L14M6F01 L14S6F01 SB10F46471 SB10F46472

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight310g /10.93 oz
Gross Weight460g /16.23 oz
Approximate Weight460g /16.23 oz
Dimension 206.53 x 63.30 x 26.00mm

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 ThinkPad T440 shows the wrong Wh rating in Lenovo Vantage after fitting this battery — is the cell faulty?

The Wh figure shown in Lenovo Vantage and the BIOS is read from the cell's EEPROM, not measured in real time. The EEPROM on a replacement cell may carry a rated value that differs slightly from the original OEM figure, which causes the mismatch in system info. The cell itself delivers the correct 48.84Wh capacity in use. No action is needed — the discrepancy is a metadata difference, not a performance fault.

The charge indicator on the ThinkPad X240 stops at 80% and will not go higher — is this a bad cell?

Lenovo's BIOS includes a charge threshold setting that caps charging at 80% to reduce long-term cell wear. This setting persists after a battery swap because it is stored in the BIOS, not the cell. Open Lenovo Vantage or ThinkPad Battery Manager, navigate to the Power section, and set the charge stop threshold back to 100%. The cell will then charge to full.

After replacing the battery, the OS fuel gauge jumps around wildly — reads 60%, then drops to 12%, then climbs back up within minutes. What causes that?

The fuel gauge IC in the ThinkPad tracks capacity by integrating charge and discharge current over time, using a reference map built from the old cell's behaviour. A new cell has a different voltage-to-capacity curve, so the IC's estimates are unreliable until it has collected enough real cycle data. Run two to three complete discharge-to-hibernate cycles followed by full uninterrupted charges. The gauge readings stabilise once the IC has mapped the new cell's actual voltage curve. After three cycles, the reading at full charge should hold steady at 100% under normal load.

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