The active cooling mod that O-L did was a classic. I thought he did it to an SRK, adding a fan. Maybe it was the mod where he added another battery carrier, turning it into 2S4P. Can't find the link though, even in the mod list: https://budgetlightforum.com/t/-/18590. Must be missing it...
He did several SRK mods - all classic BLF mod threads, well, just about all O-L mod threads are classics. We need to create a list of SRK posted mods to have here as a reference.