How much does it cost? 1  Depending on the brand of the laptop, the average laptop charge is going to range anywhere from as little as $10 to as much as $80. 2  This Universal AC Adapter that is highly rated on Amazon retails for $12-$35, while a replacement laptop charger for a Dell Inspiron retails for $7 to $15.ow much does it cost? 1  Depending on the brand of the laptop, the average laptop charge is going to range anywhere from as little as $10 to as much as $80. 2  This Universal AC Adapter that is highly rated on Amazon retails for $12-$35, while a replacement laptop charger for a Dell Inspiron retails for $7 to $15.