No, running the timer does not affect battery life on your iPhone/iPod touch. In fact, when you leave TDF Tracker (to use another program, make a call, etc.) the app is suspended by iOS 4 in newer devices and quits completely in other devices/older versions of iOS. The timer in TDF Tracker gives the appearance that it is running all the time – but in actuality, it just keeps track of when the timer was started and when it is stopped. More info on the timer can be found in the "How the Entry Timer Works" help article.
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