I have a laptop (Samsung X360) that requires 19 V through the AC adapter entry. I want to add an external self-made battery through this entry. Since I will not be able to match the 19 V exactly, by how much lower/higher may the voltage deviate from the required 19 V ? Is it better to have 1V less than 1V too much ? Is it safe to experiment a little ? lower voltage , less risky than higher ? Is there a safety protection built in the laptop ? Only a fuse will blow up without more damage to the rest of the laptop ? Elglobie.
A better question is why can't you match the 19v? If you can do +1/2v, why not slap a buck converter or something on it?
Cells are 3.3 Volt I prefer not to use a converter because of losses. What losses do the best converters have ? Any link to those ? Assume I use 5 cells * 3.3 = 16.5 6 cells * 3.3 = 19.8 What converters can convert the above voltages to 19 V ?
You'd have to use an extra cell, then use a DC/DC buck converter. TBH though, 19.8v will probably be fine. If you're really worried, what's the current draw going to be like; you might be able to use a beefy zener diode.
