Technize

What Battery Does a Lenovo ThinkPad T440 Take?

Lenovo ThinkPad T440

This laptop uses 2 separate batteries — here is what fits each.

Rear battery

Part numbers

  • 45N1775 — seen in 27 reports
  • 45N1127 — seen in 17 reports
  • 45N1736 — seen in 5 reports
  • 45N1734 — seen in 3 reports
  • 45N1735 — seen in 3 reports
  • 45N1738 — seen in 2 reports
  • 45N1767 — seen in 2 reports
  • 45N1125 — seen in 1 report

These are interchangeable OEM part numbers — any of these fits this slot.

Manufacturer
SANYO, LGC, SMP
Capacities observed
23.2 Wh, 23.5 Wh, 47.5 Wh, 71.1 Wh
Voltage
11.10 V
Chemistry
Li-ion

This model legitimately shipped with multiple capacities in this slot — match the Wh rating on your existing battery’s label.

Based on 62 reports.

Front battery

Part numbers

  • 45N1773 — seen in 29 reports
  • 45N1111 — seen in 25 reports

These are interchangeable OEM part numbers — any of these fits this slot.

Manufacturer
SANYO, SONY, Batt Manufacture
Capacity
23.2 Wh
Voltage
11.10 V
Chemistry
Li-ion

Based on 55 reports.

Based on 62 independent hardware reports for the Lenovo ThinkPad T440.

Before you order: check the part number printed on the label of your current battery against the numbers above. Vendors frequently ship different battery suppliers — or entirely different capacities — under the very same model name, so the printed part number is the only way to be certain of a fit.

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Check its SSD too →

How we know

This answer is derived from 62 independent hardware reports for the Lenovo ThinkPad T440, of which 100% agree. We publish a model only when the reports agree overwhelmingly.

Check it yourself

On Windows, open a terminal and run powercfg /batteryreport, then open the generated HTML report — it names the battery’s model and part number. On Linux, run upower -i /org/freedesktop/UPower/devices/battery_BAT0. On any laptop, the surest method is the label printed on the battery itself, visible once you remove the back panel.

More Lenovo laptops

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Battery part numbers derived from linuxhw/DMI, licensed CC-BY-4.0.