Lenovo IdeaPad S540-15IWL GTX

Type 81SW Laptop, from 2019 9 hardware reports
Memory
Up to 20 GB
2 laptop-size slots
Battery
52 Wh / 70 Wh
Reported by the batteries
SSD and charger
Coming next
Checked from separate sources
Upgradable

Yes. 2 slots, up to 20 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
20 GB in two or more machines
Firmware says
12 GB maximum (often wrong, so we show what machines run)
How sure
9 of 9 reports show this layout
See 8 GB DDR4-2400 SO-DIMM on AmazonOpens an Amazon search for this exact spec.

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

2 laptop-size slots
Illustration
Battery

Batteries in these laptops report 52 Wh or 70 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 IdeaPad S540-15IWL GTX battery on AmazonMatch the capacity and part number to the label on your battery.

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

Illustration

Questions

Can I upgrade the RAM in the Lenovo IdeaPad S540-15IWL GTX?

Yes. 2 slots, up to 20 GB seen working. It takes DDR4-2400 laptop-size sticks (SO-DIMM).

What type of RAM does the Lenovo IdeaPad S540-15IWL GTX use?

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

How much RAM can the Lenovo IdeaPad S540-15IWL GTX take?

Machines in the reports run up to 20 GB. The firmware reports a maximum of 12 GB, a figure that is often wrong.

What battery does the Lenovo IdeaPad S540-15IWL GTX use?

Batteries in these laptops report 52 Wh or 70 Wh, going by 9 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 IdeaPad S540-15IWL GTX, and the type code starts with 81SW.

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