/diy/ - Do It Yourself

The ethernal question: Powering electronic projects with batteries.

Obviously li-ion cells are desirable, because they have a high energy density. Also they are basically small explosives if you don't know what you are doing for the same reason.

I wanted to power a Rpi + screen with li-ion cells, so I figured in order to not build a bomb I'd use a BMS. Now all the BMS I've seen say that you should keep the wires from the battery to the BMS as short as possible, but I want the batteries to basically be in one line, as if they were in series, but I won't connect them in series, because that means I can't control them via the BMS effectively anymore. Pic is a shitty drawing about what I mean. Would this result in issues? Why do they want the wires to be so short? Since it's DC I fail to see how wires could make that much of a problem (obv the wires need to be of adequate diameter to support the current, but that's it right?).

If the whole idea is retarded, what else should I use?