sound box doesn't connect to my mobile!

my JBL FLip3 doesn't connect to my mobile ( Iphone S ) , there is no typical sound when connecting ,

MI phone do recongize them , I do reseted the JBL Flip 3 without success, I also note that the box doesn't fully complete the charge using the usb cord ( reach between 3-4 points over 5 ), also I noted that a red light turn on in the first display charging points

This problem hapenned suddendly !

By the way, how can realize if battery is ok ( damaged ? ) or not, as the equipment is 1 year use, and less use..

thank you !

best regards

no hace el sonido caracteristico de conexion, el celular si ubico al dispósitivo. Ya lo resetee y nada. Veo tambien que no termina de cargarse la bateria y aparece una luz roja en el primer punto de escala de carga ( 5 puntos )

muchas gracias !