I guess you didn't read the post. I'm NOT concerned about battery life, I just Don't want an AV/Firewall running all the time when it is not needed. Simple.
If my phone is off-line most of the time there is no need for that particular type of program to be running in the background too.
I like to use my phone so I charge it every night to make sure I have battery during the day, I also plug it to my USB at work some times If I need extra juice so again, NO, Battery life is not a concern.