/tech/ - Technology★

>>897256 (OP)

The laptop will draw more current as a result. Which may or may not damage the power supply itself depending on its tolerances. But likely the laptop will either not have sufficient voltage to turn on or if it does will likely not have enough power to keep it running when the CPU/GPU requires more wattage than is available.

12v is too low for a laptop that needs 20v to charge. You could probably get away with 15 volts if the rated amperage is sufficient

Would you be able to work stably and reliably with a blood pressure of only 75/50?

>>897256 (OP)

Using too little voltage is almost never dangerous (as long as the polarity is correct), it just might not do anything.

>>897270

>>897275

Ok I tried using a 12V 2A power supply on a chinkshit 20V 1A laptop which I don't care about too much. It worked fine even when the battery was removed (I opened a bitcoin miner to load the CPU, no problem) but it didn't charge the battery when I replaced it (charging light remained off, "power" light was on).

>>897275

Instability (whatever the underlying cause) can almost always lead to data loss or corruption though.

>>897289

I bet that any voltage sufficient to power the 5V rail on the voltage converter would be fine. 5V is basically the highest voltage used in a laptop aside from the battery and its charging circuit.

Imagine how nice it would be to stick a bunch of power banks to the bottom of a laptop (in series to give 10V) and have 24h battery life.

>>897289

>Ok I tried using a 12V 2A power supply on a chinkshit 20V 1A laptop ... but it didn't charge the battery

Laptop lithium batteries are typically either in a 3S or 4S configuration which have a peak charge voltage of 12.6V and 16.8V respectively. The internal charging circuit would only be a buck converter which needs a bit of head room above 16.8V but would be fine stepping down to the 5V, 3.3V, etc. the rest of the thing needs to power on. This is why the 19V power pack is all but standard these days.