I have a 4 slot battery holder with 2 wires coming out of it, best I can describe it. I'm planning to get a 14.8V Li-ion PCB charger (of course this will be used with 3.7V Li-ion batteries).
One thing I don't understand to do is the connection, as in do I just connect one wire to the positive end and the other to the negative end? Or should I instead get a separate 4 slot battery holder and make the connections like this? https://gyazo.com/fa6e1f7c2dd25f4c580b62b9053dde22