What Battery Does a Lenovo ThinkPad T420 Take?
Lenovo ThinkPad T420
Here is the replacement battery this laptop takes.
Battery
Part numbers
42T4763— seen in 26 reports42T4791— seen in 26 reports42T4799— seen in 20 reports42T4911— seen in 20 reports42T4793— seen in 16 reports45N1001— seen in 16 reports45N1011— seen in 10 reports45N1005— seen in 9 reports
These are interchangeable OEM part numbers — any of these fits this slot.
- Manufacturer
- SANYO, LGC, Panasonic, SONY, <BAD INDEX>
- Capacities observed
- 47.5 Wh, 56.2 Wh, 86.6 Wh, 93.2 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 187 reports.
Based on 187 independent hardware reports for the Lenovo ThinkPad T420.
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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How we know
This answer is derived from 187 independent hardware reports for the Lenovo ThinkPad T420, 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
Battery part numbers derived from linuxhw/DMI, licensed CC-BY-4.0.