Lenovo ThinkPad S5-S540
Yes. 2 slots, up to 8 GB seen working.
It takes DDR3-1600 laptop-size sticks (SO-DIMM).
- Slots
- 2 SO-DIMM slots
- Type
- DDR3-1600 204-pin SO-DIMM
- Most seen working
- 8 GB in two or more machines; one machine runs 16 GB
- Firmware says
- 16 GB maximum (often wrong, so we show what machines run)
- How sure
- 8 of 8 reports show this layout
Worked out from 8 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.
Batteries in these laptops report 63 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.
From 8 battery readings. Sources and method. Updated 9 Nov 2026.
IllustrationQuestions
Can I upgrade the RAM in the Lenovo ThinkPad S5-S540?
Yes. 2 slots, up to 8 GB seen working. It takes DDR3-1600 laptop-size sticks (SO-DIMM).
What type of RAM does the Lenovo ThinkPad S5-S540 use?
DDR3-1600 laptop-size sticks (SO-DIMM, 204-pin).
How much RAM can the Lenovo ThinkPad S5-S540 take?
Machines in the reports run up to 8 GB, and one runs 16 GB. The firmware reports a maximum of 16 GB, a figure that is often wrong.
What battery does the Lenovo ThinkPad S5-S540 use?
Batteries in these laptops report 63 Wh, going by 8 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 S5-S540, and the type code starts with 20B3.