Okay, so it's pretty easy and fast to charge the RC. Is it better to let the RC go down all the way to 20%-30% before recharging or it's okay to plug it into the charger when the is below 90% but above 60%?

Hello UCLABruins, it is recommended to discharge and charge the RC thoroughly once a month.If you decide to store it, 50% battery level will be good. Normally the battery level before charging doesn't matter but it shouldn't be too low.