How we test battery back up time using load testing especially for mobile testing ?

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1.charge the mobile up to Max capcity voltage.
(i.e untill it should shows all the power
indicating line are displayed).
2.call to a number and continuously use it untill
the battery fully drained out.measure the time of 
life for one full cycle.
3.Charge the battery upto 20% of it's capacity
use it untill the battery fully drained out.
4.Charge the battery upto 40% of it's capacity
use it untill the battery fully drained out.
5.similarly check for 60%,80% of battery charge 
capacities and measure the battery backup time.
6.verify the battery life by contunously sending 
shoty data messages.
7.Verify the (GUI) power indcating lines or levels 
correctly displaying or not with respect to 
actually charged battery level.
8.test the phone in non signal coverage area and 
measure the battery stand by time.
(bcoz in non signal coverage area cell continuosly
searches for signals due to this the power 
continuosly dissipated as RF signals and 
battery drained very soon)

 ==============
Load testing: 
We need to automate test to lauch mobile features several 
times and for long durations. Like generate thousands of 
calls, launch the camera for several times, toggling the 
bluetooth for hrs etc.

Battery backup:
We need equipment to test the Battery backup/talk time etc. 
Agilent has some of the equipment, wherein we have a Power 
supply connected to a simulator battery and a SW console 
running on your PC which measures and caluclates the 
current drain. A bunch of caluclations after that will 
determine the battery back up or talk time etc. 

And Ya we can also measure the battery back time using the 
mentioned technique while the PUT is being load tested..

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