+@orbital thank you for your effort to help.
Let me rephrase my question.
I have a HP Pavilion 15 laptop.
The charger delivers:
45W 19.5 volt 2.31 A
Would it be safe to direct drive from a Ryobi 18/20V battery into my laptop?
A 65 or 90W HP charger will not damage you laptop, it'll just take what it needs
edited out some analogies ....
Overall, if you're not comfortable, let the idea go.
There are many ways to get power
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