Last time I used my 175 hour old 2320, ( about a week ago) I had no problems. Went to start it today, and I found I had left the key in the ON position, and it would not turn over. The battery volatge was about 2.5volts. Jumped it from my car, and it would stiil not turn over, no clicking, no sounds, nothing. Battery voltage with the jumpers in place was 13.5 volts. Is the battery shorted? Any other ideas?