Technize

What Battery Does a Lenovo ThinkPad T400 Take?

Lenovo ThinkPad T400

Here is the replacement battery this laptop takes.

Battery

Part numbers

  • 42T4644 — seen in 11 reports
  • 92P1137 — seen in 10 reports
  • 42T4678 — seen in 6 reports
  • 42T4645 — seen in 5 reports
  • 42T4677 — seen in 5 reports
  • 42T5264 — seen in 5 reports
  • 42T4653 — seen in 4 reports
  • 42T4667 — seen in 3 reports

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

Manufacturer
SANYO, Panasonic, LGC, SONY, Not Specified
Capacities observed
56.2 Wh, 84.2 Wh, 47.5 Wh, 37.4 Wh
Voltage
10.80 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 60 reports.

Based on 60 independent hardware reports for the Lenovo ThinkPad T400.

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 60 independent hardware reports for the Lenovo ThinkPad T400, 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

All Lenovomodels →

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