[NuLLKiLL]

The OP is right in the fact if you are killing apps your phone needs all the time to run you might hurt battery life. Programs like voice mail messaging and email (if you use them) shouldn't be closed down. It will take longer for the phone to get into them when you need it and take extra processing power that could drain the battery like 30 mins before normal.

The OP is wrong on his assertion all task killers are bad. How people use them may not be beneficial to their battery or it may. I personally always use a TK to close down the browser as it takes about 16 megs of RAM when open all the time. I also used it to see all the sprint and google bloatware running and then removing it since my phone is rooted. Again this is a great help to battery. Oh and you HAVE to use a TK before you load up a graphics intensive game or it will play laggy. Now I can hear you saying but Android manages the RAM perfect! BullShit! If it did then I wouldn't notice a difference when closing down all programs before I load up Asphalt 5. Letting andoid manage progrmas and it's choppy closing everything down and it runs smooth.

I have not heard of any real reports that TK eat your battery. We have some of the most knowledgeable guys in the industry and they don't agree. Now you may say "well these guys aren't from HTC or Google" and I would say "yeah I know their shit works unlike HTC and google." The people who fix Googles screw ups yes our devs here and at XDA are 10 time more knowledgeable than any idiot working for Google.

If you found evidence from "REAL" devs and programmers I might consider it as true but...