iPhone 4S standby time 200 hrs, battery 3.7V 1420 mAh, SAR 1.11
Samsung Galaxy S2 620 hrs, 1650 mAh, SAR 0.338
If ignoring battery difference and assuming the same standby condition
resulted primarily from RF power consumption, S2 radio is 3x more efficient
than that of 4S. If battery discharge is linear, the power output of S2 can
be ~ 1/3 of that of 4S.
- Note that during standby, a phone must receive and transmit in order to
maintain its status with base stations.
In the SAR equation, \sigma and \rho are independent of phones. Only |E(r)|
^2 matters. If E(r)^2 of both phones are linear with respect of each other
everywhere, we will see S2's |E(r)|^2 is approximately 1/3.28 of 4S's |E(r)|
^2.
- In SAR tests, a phone is assumed to be in transmission for a certain
amount of time (6 minutes?).
It is interesting that how these two sets of numbers can match and how
Samsung did this.