Check whether there is electricity in the cigarette lighter socket. If there is no electricity, the fuse of the car is broken. Replace it. Try another data cable, it can't be charged if it's broken. The above two steps are not enough is the car charging problem, change a good. Conventional car charger for car battery (car 12V, truck 24V) power supply, widely used in a variety of portable, handheld equipment lithium battery charging field, such as: mobile phone, PDA, GPS, etc.; The car charger should consider the actual needs of lithium battery charging (constant voltage CV, constant current CC, overvoltage protection OVP), but also take into account the harsh environment of the car battery (transient peak voltage, system switching noise interference, EMI, etc.); Therefore, the power management IC selected by the car charging scheme must meet the following requirements: high voltage resistance, high efficiency, high reliability, low frequency (conducive to EMI design) switching power chip; Generally speaking, it is required to \"leather\".