Since, I am frequently needing to reference and re-find and search for this information on this HP EliteBook 840 G5 Laptop I own. I am taking ownership and putting up my own source of this information so it does not go missing, and maybe other may find the info useful as well.

Support Links

HP EliteBook 840 G5 Quick Specs

HP EliteBook 840 G5 QuickSpecs - PDF

HP EliteBook 840 G5 User Guide

HP EliteBook 840 G5 User Guide - PDF

HP EliteBook 840 G5 Service Guide

HP EliteBook 840 G5 Service Guide - PDF

Official HP Support

HP EliteBook 840 G5 Notebook PC - Product Support page

iFixIt repair references for the HP EliteBook 840 G5

HP EliteBook 840 G5 Repair - iFixit

Power and charging facts

USB-C power adapters

45 Watt or 65 Watt recommended by HP

For 45 Watt adapter HP notes the following voltages and wattage’s supported.

5V/15W      (3 Amps)
9V/27W      (3 Amps)
10V/37.5W   (3.75 Amps)
12V/45W     (3.75 Amps)
15V/45W     (3 Amps)
20V/45W     (2.25 Amps)

For 65 Watt HP Provides the following details for output ratings.

"Output power 65W
DC output 5V/9V/10V/12V/15V/20V"
< 8.0 Amps

HP DC pin and barrel jack AC adapter

• HP 45W Smart AC adapter
• HP 65W Smart AC adapter (19.5V DC 3.33 Amp)
• center pin is positive, outside casing is negative
• blue tip 4.5mm (.45 cm) outside of barrel diameter.
• AC Cord uses IEC C5 or Mickey Mouse Connector if you need to find a replacement cord.
• DC cord is not removable.