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As it says, "computed" - there is a fair margin for error there, as there are parameters affecting power consumption (like WAN, Wifi or Bluetooth remote side specifics) the phone (and its developers) cannot determine.
@Ajith5 I think that's the entire battery consumed since the phone has been charged over 90%. You might have charged the device but not to that percentage, so it might be 2700 without any problem.