Restocking my hobby needs after 20 years off and could use some advice.

icharger-106b

or

Dynamite-Prophet-Sport-Duo-AC-Charger-6S-6A-50W-x-2

or

Venom Medion Dual Output 10amp DC Multi Charger U/L

I like the idea of a dual charger and I could make a powersupply ala YouTube... Any recommendations? Running 1/12 right now with 1s (1 cell) 3.7v Lipo Batteries. Most people use a 5500mah or greater battery. Also, do these batteries need to be discharged and is that something I need in a charger?

Thanks for your help.