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@paulrickards 15 watts isn't a lot of power and most older laptops don't do PD. Is the output voltage select-able and static, or is there an interrogation process?

Be nice to have this for older laptops with dead batteries for which replacements can't be sourced. A lot of those are in the 18-21 volt range, though.

A chonky DC-DC ups/charger with some sort of selection of common tip outputs would make for an interesting kickstarter.