You did a great job in soldering and safety. Check out the as150 connector antispark. Solder those right and eliminate the yellow wire. You can plug two batteries into eachother with red and black and use the other red and black to plug into the esc, multi functional. But maybe 7years ago they were not here yet😉👍
Bahco make a set of them, you can get those from RS components and various other electrical wholesalers in the UK sell different makes. The bahco ones are what I use for work, they are razor sharp and comfortable to use. uk.rs-online.com/web/p/cable-cutters/0254232/
Hal Staniloff it doesn't matter what you think it matters what I'm telling you and I would never lie to you even when I tell you the truth LOL just kidding... the wire that he is using to solder with is a 60/40 rosin core meaning that there is flux in The Wire itself / the only way I will be willing to believe you is if you can give me an answer to a problem I need to solve which is what would the room temperature have to be for a 1 pound block of ice and one pound of freshly boiled water have to be for them both to equalize to the same temperature at the same time and hold that temperature ;)
Solder for years at my job. I was taught by pro doing it for 50 plus years. The flux in the solder is not enough, you always need use extra flux newbie it aids in heat transfer!