The Smart charger is the fastest way to charge your EnergyPak and is compatible with our newest systems. It takes 2.2 hours to charge 80 percent with an EnergyPak Smart 625. The Smart charger also helps extend battery life. When the EnergyPak is charged more than 500 cycles, this charger uses a lower voltage, so the cells are used in a less energetic way. Battery life is extended while total charging times becomes slightly longer. Switching between full charge and 60% storage mode can be done with the simple press of a button.