Warning device for indicating critical condition of starter batteries in vehicles

摘要

A warning system for indicating a critical charge condition of starter batteries in vehicles, especially in motor vehicles which operate according to the hydrometer principle; a specially constructed float is movably arranged on the inside of an areometer housing connected with the inside of the battery housing by way of apertures in such a manner that a warning signal is adapted to be triggered when the float sinks to a predetermined height corresponding to a predetermined acid concentration.