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Asked on Super User by Shakti, 5 years ago. No reply there for at least a week.

Laptop shuts down without warning when on battery irrespective of OS

I have an HP laptop with Ubuntu 18.04 and Windows 10 both installed in dual boot mode. When I'm working on the laptop with battery power, the laptop shuts down without any warning irrespective of the OS I'm working in. This never happens when I'm working on AC power, so I don't think that overheating is the culprit here. Moreover, when I switch on the laptop after the abrupt shutdown the battery percentage is usually a good value ( 50%). When I checked the battery with the HP diagnostics tool it showed that battery was becoming weak but what I'm not able to understand is that even though it is

This question is one of 2 reports of the same problem:

Alienware 13 R3 - laptop shuts down without warning under heavy load ONLY when on battery

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