I bought these to run in my new Arrma Typhon 3s, and they are CRAZY good. They just barely fit lengthwise into the Typhon (have to remove the two spacers), but the fit is secure. They are very well made and seem durable but the main event is how much power they spit out and how long they last. I was driving my car around my street for 20 min then took it to a muddy construction site and was bashing it hard. Lots of full throttle runs, lots of deep mud and water. Every time I got on the throttle it takes off like a rocket, so I am inclined to believe the C rating is accurate. The power is instantaneous. Then after all that, the battery wasnt even warm and I went home and did a bunch of high speed runs down my street and its still not dead or showing any signs of being low. I charged both up expecting to need both, but I didnt even get through a single battery!