I have a 2005 chevy trailblazer with a starting problem. ?

[mdc]

I notice the lights dim once in a while. If i leave the radio playing without the vehicle running for 30 mins or so its like completely dead. Could this possibly be a bad battery?? If i let it sit for a few hours it will start without a problem.

[army]

most likely a battery problem take it to an auto center and have it tested, if the battery is fine then look at your alternator its possible it isn't charging your battery.

[454burban]

sounds like you got a bad battery, any auto parts store can test it, they should be replaced every 4 years or so, so she should be getting to that point. if not test the alternator, agian can be done for free at any auto parts store.

after that i would say your leaving a different aplience on or you have a bad starting connection. aka check 2 make sure you glovebox light turns off, trunk light, mirror light ex...
if none of that your starter may have a bad connection, so it might not be a power problem but a wiring problem.( i dont think it is though)
but ya just go test that battery and alterbator.
good luck!