I test the Yeti by putting it through a series of terrains, Grass, Rocks, Snow, Hills, Ice, and I also test it's top speed and acceleration. Very fast and quick charge! It takes 80 Minutes to get a full charge in a 5000 Milliamp 11.1 volt battery which gives me a 52 Minute run time. The Axial Yeti 1/10 scale is a GREAT buy and LOTS of fun! I use a venom