Hello yesterday with my Punto 176 bj 94 drove a total of 320 km back and forth highway. on the return trip the indicator light of the battery went on. When I came home and briefly turned off the engine, the car did not jump any more. The battery was empty. Today we pushed it on, but it simply went off during the ride. What could this be? The battery would have to charge itself during the ride. Is it just a defective battery or possibly the light mash or something else? thank you