Ok... dunno, but mine differ and I have no battery issue
Let's see I have
start on backlight off = on (off in mine, just set your on battery idle timeout as desired)
power off in 15s = off
blank on talk on = off
external
start on back light off: on = off
show task count - on = off
show alarm - on = off
Of all of those, it's most likely the first couple that might cause a difference in power usage.
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