I would be more worried about ensuring the voltages between the batteries are virtually identical. The voltages need to be close to in order to avoid any problems with over charging which can lead to fires that are extremely difficult to put out. So if both of your batteries read 3.7V or one reads 3.6 and the other reads 3.7, you should be fine. You just don't want them too far apart in terms of voltage.so the battery arrived, and the manual thing said to charge it before using it, but they already are charged. do I still need to charge it?
No you want 22awg stranded wire for the batteries at leastwhen Im wiring up the batteries, can the wires be 30 gauge, or do they have to be thicker
Yeah, you're gonna want to use 22awg for the batteries as well as for things like the charging wires, and the power wires to the Wii and screen. Anything that draws a good amount of power you'll want 22awg for.No you want 22awg stranded wire for the batteries at least