Wire's up to you... I like 18 though... try to get the deans noodle wire as it is much easier to work with.
That charger should do what you need it to it just looks like the losi version of those cheap and crappy ebay ones.... if you want to run li-ions in different scale cars then look for a better charger otherwise that should be fine.
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Duct Tape is like the force:- it has a light side and a dark side and it binds the universe together.....
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