I recently got a "Boltpower Car Jump Starter, Rocket Socket" that had an interesting feature, it had some odd looking adapters for laptops (none helpful for me unfortunately), that are supposed to charge a laptop battery.
The odd thing about this adapter is that it has a button that easily toggles 12v, 16v, 19v, off... as I understand, laptops need input power at the specified voltage and minimum amperage (in my case 19.5v 4.6a). I have to wonder if this is actually safe as laptop power... and if I found an extra plug and wired it to it, would it be safe to plug in?
The description on Amazon says "over current protection, short circuit protection, overload protection, over-voltage protection" and I'm curious what method they use for this - is it easy to implement if I were to build a custom charging adapter or kinetic generator of some sort - or is this expected to be protected on the laptop battery, similar to the overcharge protection that's part of every device with a li-ion?