battery connector

I can not fly my Mavic pro drone because of the battery issue. It's only 4 months but now I got it only 10mintues backup! I don't know why? Can anyone help me, please? Thanks in advance.

I’m looking at an ESC (https://www.getfpv.com/flycolor-francy-blheli-32-20a-30a-40a-50a-3-6s-dshot-esc-w-led.html) and there’s no mention of what connector it uses. Does anyone know, or do some ESCs come without connectors and I have to buy one and solder it on? It’s not the first ESC I’ve seen...

I have acquired a Blade 200 QX and I need to make a charger adapter, what connector does it use? it's similar/ same as the Dromida Ominus, and I have one of those. Also is the Spektrum DX6i controller good for it?

I am just getting started and have ordered my first battery and esc. The batter is coming with JST connector and the ESC has nothing. I would like to start off on the right foot and go with one connection type for every battery/esc. What type of connector does everyone recommend? Thanks