They charge at 10 amps per Channel. Most batteries recommend charging at a 1C charge rate so unless you have 11000 milliamp batteries then you can charge at the recommended charge rate for the batteries. some batteries do have a 2 to 5c charge rate. However they do not recommend charging above A1C as this will shorten the length of your battery. There are some that have $1,200 battery chargers that charge at 25 amps and it takes 5 minutes between races to charge the battery. But they get approximately half of the expected life out of the battery because of doing this. You will also have to make sure your battery charger has a storage setting on it so that you can put your batteries away without ruining them. The Traxxas charger does not have that option. These are under $200 and will do everything that you will need out of any charger