Here is an interesting calculator that uses cell resistance to estimate the maximum recommended average current draw to prevent pack damage:
My charger displays the resistance of my Bonka batteries between 1.5 and 2 ohms. According to this calculator you shouldn’t draw more that 257 amps from a pair of Bonka batteries or they will get too hot and damage the cells. Over 60 degrees C is too hot.
After flying 10 minutes on a pair of Bonka’s I measured the heat with an IR gun and they were 65 degrees C. However, after flying 25 minutes with 4 Bonka batteries they don’t get hotter that 55 degees C. Therefore, I will continue to use 4 Bonka’s to protect my investment from premature damage.