inputs.text: initial headache - opened box last night excited placed unit charger per instruction manual morning unplugged see sounded totally dead id heard others complaining problem stated use included battery charger charge first however no additional charger mention instruction manual investigating online no avail reviews except amazoncom web site sonic impact doesnt even unit site way reach email form decided google sonic impact lo behold ive got phone number called gentleman answered phone aware problem informed sort regulator unit prevents charging voltage drops certain level told problem fixed first batch if5s already kindly offered send external charger batteries no cost along couple extra batteries barring complications ready roll unit sounds quite nice volume sufficient think happy if5 number sonic impact office california 6192322555