Sofirn SP70 Alone $50, PM for AMZ US CODE(LIMITED)

According to my tests these have a quite similar internal resistance compared to the Shockli 5500 (PLB-55-A cell).

https://budgetlightforum.com/t/-/51773/91

However, the 40T or even the 30T should perform even better as long as the electric path is capable to drain enough current from these cells.