Lenovo IdeaPad S540-15IWL

Type 81NE Laptop, from 2019 7 hardware reports
Memory
Up to 12 GB
2 laptop-size slots
Battery
53 Wh / 70 Wh
Reported by the batteries
SSD and charger
Coming next
Checked from separate sources
Upgradable

Yes. 2 slots, up to 12 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
12 GB in two or more machines; one machine runs 20 GB
Firmware says
12 GB maximum
How sure
7 of 7 reports show this layout
See 4 GB DDR4-2400 SO-DIMM on AmazonOpens an Amazon search for this exact spec.

Worked out from 7 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.

2 laptop-size slots
Illustration
Battery

Batteries in these laptops report 53 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 battery on AmazonMatch the capacity and part number to the label on your battery.

From 7 battery readings. Sources and method. Updated 9 Nov 2026.

Illustration

Questions

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

Yes. 2 slots, up to 12 GB seen working. It takes DDR4-2400 laptop-size sticks (SO-DIMM).

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

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

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

Machines in the reports run up to 12 GB, and one runs 20 GB. That matches the 12 GB maximum the firmware reports.

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

Batteries in these laptops report 53 Wh or 70 Wh, going by 7 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, and the type code starts with 81NE.

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