I want to make an external powerbank for my laptop, since its battery cannot be removed (MSI GP62M 7RDX). What voltage should my battery have?
18650 elements have nominal voltage of 3.7. My laptop power supply has the following parameters: 19.5 V / 6.92 A / 135 W.
Should I get to 19.5 voltage as close as possible? 19.5 / 3.7 = 5.2, so it makes 5S battery (or 6S?).
Or could I, say, make 3S battery and use a boost converter?