Solved! Can i charge 20v (65w) laptop with 19v (66.5w) input?

Vincent_Jonathan

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Mar 17, 2015
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I have Lenovo 720s, the original adapter is 20v 3.25a (65w), it's also written on the bottom of the laptop.

I'm planning to buy an external battery to charge my laptop, I found one with output up to 19v 3.5a (66.5w), can I use that external battery to charge my laptop? Is it harmful to my laptop or the external battery? Will I be able to charge my laptop with full speed if I use that external battery?
I also found one with 20v, but only 2.25a (45w), will it be a better option to pick this one instead?

Thanks.
 
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