Efficient and fast chargers are what serious airsoft players look for and Fox Airsoft got them available... "If you run different types of batteries or have some serious charging needs, these ASG chargers might be for you. The ASG A450 is the type of charger you would want if you wan to eliminate having to use different types for all the batteries you own. The ASG A680 is the top tier solution if you are a serious player who not only has different types of batteries, but require the tools to monitor the status and condition of your batteries."