Lenovo ThinkPad T490

Type 20N3 Laptop, from 2019 60 hardware reports
Memory
Up to 40 GB
2 laptop-size slots
Battery
50 Wh
Reported by the batteries
SSD and charger
Coming next
Checked from separate sources
Upgradable

Yes. 2 slots, up to 40 GB seen working.

It takes DDR4-2400 laptop-size sticks (SO-DIMM).

Slots
2 SO-DIMM slots
Type
DDR4-2400 260-pin SO-DIMM
Most seen working
40 GB in two or more machines
Firmware says
32 GB maximum (often wrong, so we show what machines run)
How sure
60 of 60 reports show this layout
See 16 GB DDR4-2400 SO-DIMM on AmazonOpens an Amazon search for this exact spec.

Worked out from 60 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.

2 laptop-size slots
Illustration
Battery

Batteries in these laptops report 50 Wh.

That is the design capacity the batteries themselves report, and the label can read 1 to 3 Wh higher. Other pack sizes may have shipped, so check the capacity printed on yours before you order.

Lenovo ThinkPad T490 battery on AmazonMatch the capacity and part number to the label on your battery.

From 60 battery readings. Sources and method. Updated 9 Nov 2026.

Illustration

Questions

Can I upgrade the RAM in the Lenovo ThinkPad T490?

Yes. 2 slots, up to 40 GB seen working. It takes DDR4-2400 laptop-size sticks (SO-DIMM).

What type of RAM does the Lenovo ThinkPad T490 use?

DDR4-2400 laptop-size sticks (SO-DIMM, 260-pin).

How much RAM can the Lenovo ThinkPad T490 take?

Machines in the reports run up to 40 GB. The firmware reports a maximum of 32 GB, a figure that is often wrong.

What battery does the Lenovo ThinkPad T490 use?

Batteries in these laptops report 50 Wh, going by 60 reports. Other pack sizes may have shipped, so check the capacity printed on yours.

Is this my laptop?

Check the label on the bottom. It should say ThinkPad T490, and the type code starts with 20N3. Other type codes share this name: 20N2, 20RY.

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