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HP probook 450 G3 DDR4 - boot without battery

HP Recommended
HP Probook 450 G3 DDR4
Microsoft Windows 10 (64-bit)

Should this machine be able to boot without a battery attached? Does anyone have one?

Seems an odd question but I'm trying to diagnose a fault turning on and I can only ever seem to get it powered with the battery in. The AC light is on and I've tested it outputting 19.5V with a meter so think that's good.

Also (I can't find it again now) but I think there is some reset (keyboard controller ?) on this machine that can only be done with the battery in and no AC adapter

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