I've been using the 100C Supreme 6400 in 17.5 TC for about 6 months. Beating pretty good with 30-40 amp charge and 4.35 per cell regularly. Only recently has it started to get a slight puff to it. Many locals use the pack and many are discharging at 40 and charging at 40+ ever round. Most are getting good life before some puffing starts. Pretty sure if were charging under 20 amps and keep around 8.4, you'd never have any puffing or issues. IR numbers have been decent .9-1.4 depending on pack or users Icharger since they all seem to vary some.