I'm using latest OS on a Curve, but I think this should be pretty much the same on all recent versions. You should have an icon for "Manage Connections" - click it, and you'll have the option to turn your various connections on and off manually. On the 8300, this includes Mobile Network and Bluetooth Network, and you can also Turn "All Connections" off with a single click.
Another good trick for saving battery: if you don't put the BB in a case with a magnetic "sleeper", then you should put the device in "standby". On the newer devices, there's a button at the top of the device that does this if you hold it in for a few moments. Saves battery as if you had put the device in an OEM case with the sleeper magnet.
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