Battery runs down quick

[dsrour]

On My 04 YukonXL 2500 8.1, the battery seems to discharge quickly eg if key left on radio on, 2-3 hours. This seems shorter than I would have expected. I guess other sytems are running w/ key in accesory mode, or could battery be bad. Has about 5K miles. Only 600CCA rating

[motocross250f]

My battery goes dead after about 15 minutes at 1/3 volume. Had it tested and they said everything was good. It could just be my amp pulls too much power.