Every portable battery charger have a cable. That cable is usually connecting the PC USB port to the Portable Battery Charger so as to charge the battery inside the Portable Battery Charger.
So, is it safe to use it to connect the PC USB Port to the phone directly? (The reason that I asked is because each cable have resistance levels, which I am concern if it will affect the charging of the phone if used in this way and will it cause damage to the phone or the phone battery or the cable or the PC USB port.)