Unfortunately yes you will have to take the battery out and take it to a place that can test them! I could sit and listen to the radio, turn on the headlamps etc with mine as well. I tried to explain that it still had 12 volts, enough to run most everything in the car, except the starter, that requires cranking amps. If your battery has no cranking amps, sitting with it on jumper cables will do nothing, besides you cannot charge a battery in 15 minutes. I am willing to bet your battery is the culpirt.