It depends on the type and age of the charger, the application and whether your charging needs have changed. Many newer chargers improve energy efficiency much like HE (high efficiency) appliances do and offer advanced technology to help prevent battery damage due to improper use. For example, the HAWKER IONIC charger helps overcome certain issues that arise when a battery is treated improperly during operation. From an energy efficiency perspective, most warehouse operations want to conserve energy and recognize the importance of reducing the amount of power consumed from the energy grid. High frequency chargers help meet both goals because they are much more efficient in converting A/C power to D/C and don’t waste as much power as older charger technology.