So far my son and I have ran these in our traxxas summits(stock), and have had no issues!my son and I climbed a small hiking trail that was 2.5 km each direction and spent majority of the time in low gear- my sons batteries lasted the whole afternoon with his type of driving,and mine lasted 90%of the afternoon with a slight mix of hard acceleration in with our trailing adventures on the climbing trail. So far we've only had a few cycles on them,but we haven't had to burn through them because they last long. After our 5km round trip hike my sons batteries barely took 6000mah charge , where as mine were both up close to 7000 mah. We just use the stock lvc on the summit esc. They seem worth the money and are lightening quick to ship to sumas Washington. Batteries all arrived perfectly balanced, though they were packed a little below my expectations in the shipping box( surrounded in small individual bubble wrapping. I will be buying more of these batteries!