The Aerovoltz Battery Management System Balance Charger is the only charger on the market designed specifically to work with the Aerovoltz battery. The primary advantage to the Aerovoltz BMS Blance Charger is the balance charging function. The Balance mode balances the voltage of each cell or cell pack while charging. By balance charging your Aerovoltz Performance Battery you insure that the battery is operating at its maximum power. Periodic balance charging can also double the expected life of your battery. This charger is not required to operate your Battery, but it is highly recommended.