General > General Technical Chat
19v laptop running on 20v charger?
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slybunda:
iv got a laptop but dont have the correct 19v 3.25a charger for it but i briefly powered it up with my other laptops 20v charger and it worked fine.
can i use this charger with the laptop long term or is 20v charger gonna kill it in the long run?
Andy Chee:
There's a similar thread elsewhere on this forum discussing your very scenario

https://www.eevblog.com/forum/beginners/can-i-charge-my-laptop-battery-at-20v-and-5a-if-the-specs-state-19-5v-and-3-33a/
amyk:
Summary of that thread: they have weird voltages that are for mostly to give the appearance of vendor lock-in. 25V caps on main power rail, with a bit of margin, is how that 18/19/20 number is arrived at.
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