in 2016 prior to the graphene labeling, here in arizona top 17.5 buggy racers where charging 2s lipo shortys to 4.35v per cell and 70 amps on a icharger. i was told by one top 17.5 racer, it was one specific protek 2s shorty, to get up with him and he would tell me which one to order. i never did, because i was only months back into the hobby, and was reluctant about spending money on a icharger, etc.