There are two main types: AC charging stations and DC charging stations. Electric vehicle batteries can only be charged by direct current (DC) electricity, while most mains electricity is delivered from the power grid as alternating current (AC). For this reason, most electric vehicles have a built- in AC-to-DC converter commonly known as the “onboard charger”. At an AC charging station, AC power from the grid is supplied to this onboard charger, which converts it into DC power to then recharge the battery. DC chargers facilitate higher power charging (which requires much larger AC-to-DC converters) by building the converter into the charging station instead of the vehicle to avoid size and weight restrictions. The station then supplies DC power to the vehicle directly, bypassing the onboard converter. Most modern electric car models can accept both AC and DC power.