The only thing the charge rate does is keeps the battery cool. Back in the day, we had to use 120v 120mm fans that were pushing copious amounts of air to keep the old packs cool while we crammed 5+ amps into them. It was common for these packs to get over 150ºF while charging. But, that is what we had to do to be competitive. And yes, we replaced packs, at a price of about $100/ea, about every 30 charges. That is not as much of an issue these days. If a LiPo reaches 40ºC, you are pushing it hard on the charging lol.