Can’t speak for longevity, as I only have 5-6 runs through them so far. Seem to be of good quality. On a 4” Rekon FR I’m getting 3-5 minutes ripping and 6-8 minutes cruising/cinematic with Hero 10 Bones. They are very small and lightweight. I charge them to 4.2, not 4.35 as they are rated, so more is possible, but I want them to last many cycles so we’re taking it easy. Value vs performance, I recommmend these packs.

GNB makes great batteries, I have 53 cycles and counting on the 3s 650 and 1100HV versions and they are just as strong as day one and fully expect these to be the same.