Does APNdroid eat battery?
I confirm it will attempt to connect all the time and drain battery in half a day in my case. To solve it you should untick the data in the network settings and check that GPRS/EDGE/HSPDA icon is not visible on top next to the signal strength bars. But at least APNdroid (or manually modify the APN name) will prevent any connection and any extra charge during roaming session.