Great battery life, cells are balanced as they should be, plenty of power for my Castle Creations Brushless system. I have yet to completely drain these batteries, they just keep going!. Overall, for the budget, this really is an amazing choice. These fit perfectly in my Hpi Vorza tray now that I have removed a little bit of foam. Very Satisfied with my purchase up to this point. I will update you if I encounter any issues!