A:AnswerMost games can use just the two that came with the console for 2 player play. On the back of the game case it will tell you what controllers can be used and in what way.
A:AnswerIt's the other way around. The left joy-con is red, and the right joy-con is blue.
If you buy a "neon" Switch system, it comes with blue (L) and red (R). But this spare set is red (L) and blue (R). If you've already bought a neon Switch system, buying this set will leave you with one pair (left and right) of blue joy-cons, and one pair of red joy-cons.
A:AnswerYes. The easiest way to pair these new Joycons is to just physically attach them to the desired system. They will pair immediately. Make sure to update them in the settings as well once attached.
A:AnswerSeems like the red one is defective. Mine last 2 days maybe a little bit more between 3 to 4 hours of gameplay minimum before asking for charge. Replace as soon as you can.
A:AnswerYes, you have to buy a charger for the Joy Cons. By the time you buy all the extra gadgets to go to the SwitchLite you may have spent the other $100 to get the regular Switch.
A:AnswerThese are the neon green joy cons by the way. They have a photo of the box art, and you can zoom in to see the it says "Neon Green/Neon Green".