HP ProBook 645 G4
Yes. 2 slots, up to 32 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
- 32 GB; one machine runs 32 GB
- Firmware says
- 32 GB maximum
- SSD slots
- At least 1 M.2 SSD slot listed by the firmware
- How sure
- 3 of 3 reports show this layout
Worked out from 3 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.
Batteries in these laptops report 48 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 3 battery readings. Sources and method. Updated 9 Nov 2026.
IllustrationQuestions
Can I upgrade the RAM in the HP ProBook 645 G4?
Yes. 2 slots, up to 32 GB seen working. It takes DDR4-2400 laptop-size sticks (SO-DIMM).
What type of RAM does the HP ProBook 645 G4 use?
DDR4-2400 laptop-size sticks (SO-DIMM, 260-pin).
Does the HP ProBook 645 G4 have an M.2 SSD slot?
Yes. The firmware lists at least 1 M.2 SSD slot, in 3 reports. Some firmware leaves a slot out, so there may be more.
What battery does the HP ProBook 645 G4 use?
Batteries in these laptops report 48 Wh, going by 3 reports. Other pack sizes may have shipped, so check the capacity printed on yours.
Is this my laptop?
Check the model name on the label underneath. It should read ProBook 645 G4.