I've been running the Protek 3600mah lcg lihv battery and the 6100mah lihv battery. All in my Associated buggy, truck, and 4wd. I only charge to 8.44v and get about 3200mah out of the 3600 battery and 5000 out of the bigger one. Running in the 17.5/13.5 classes I have had no run time issues. Using an icharger, I notice IR anywhere from 1.1-1.5 per cell.