State of charge indicator for a battery

Status indicator charging a battery, comprising a liquid electrolyte, with a transparent rod (3) display that presents a first end an observation area and at a second end, a tip (5) which is connected to a cylindrical surface (6) coating and which is formed by a conical surface (4) of reflection, and a ball holder (1) which is positioned at the second end of the rod (3) display, through which circulates electrolyte and in which is configured at least one guide channel (9) of balls for at least one ball (12, 13) with a defined specific weight, which is disposed inclinedly relative to the longitudinal axis (10) of the rod (3) display, which extends the height of the tip (5) of the rod (3) display and presents restrictors front and lower and an upper boundary wall (14) provided with an opening (15) to the second end of the rod (3) display, characterized in that the upper boundary wall (14) is connected continuously to the conical surface (4) of reflection on the way to the cylindrical surface (6) coating manner.