Lenovo IdeaPad S540-15IWL D

Type 81NE Laptop, from 2019 10 hardware reports
Memory
Up to 8 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 8 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
8 GB in two or more machines; one machine runs 20 GB
Firmware says
12 GB maximum (often wrong, so we show what machines run)
How sure
10 of 10 reports show this layout
See 4 GB DDR4-2400 SO-DIMM on AmazonOpens an Amazon search for this exact spec.

Worked out from 10 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 D battery on AmazonMatch the capacity and part number to the label on your battery.

From 10 battery readings. Sources and method. Updated 9 Nov 2026.

Illustration

Questions

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

Yes. 2 slots, up to 8 GB seen working. It takes DDR4-2400 laptop-size sticks (SO-DIMM).

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

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

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

Machines in the reports run up to 8 GB, and one runs 20 GB. The firmware reports a maximum of 12 GB, a figure that is often wrong.

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

Batteries in these laptops report 52 Wh or 70 Wh, going by 10 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 D, and the type code starts with 81NE.

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