over·charge 
/ˌoʊvɚˈtʃɑɚʤ/ verb
over·charg·es; over·charged; over·charg·ing /ˌoʊvɚˈtʃɑɚʤ/ verb 1 : to charge too much for something : to make someone pay too much money for something [no obj] ▪ He overcharges for car repairs. [+ obj] ▪ He overcharges his customers for car repairs. ▪ The store overcharged me for my skirt. ▪ The customer was overcharged (by) $10. — opposite undercharge 2 [+ obj] : to give too much of an electric charge to (a battery)
▪ I overcharged the battery.
▪ I overcharged the battery.
