Battery performance of Dual SIM phone running only one SIM Does a dual-SIM Android phone running only one SIM yield almost the same battery life as a single-SIM phone?

Will both the radios be running all the time regardless of whether both the SIMs are present?
From Wikipedia:


  Battery life (talk time and standby time) of active dual-SIM mobile
  phones is reduced, typically by about a third. For instance, Device
  manufacturer Samsung declares a standby time for its Champ Duos E2652
  Dual SIM phone of 476 hours when used with one SIM card and of 322
  hours when used with two SIM cards. To compensate the shorter battery
  life, some Dual SIM phones ship with better capacity batteries, for
  example newer Lenovo P780 have a 4000mAh capacity.


Wikipedia also describes different types of dual-sims, such as:


Pseudo-Dual
Dual SIM Shift: Accepts 2 SIMS; only 1 active at a time; 1 signal bar
Dual SIM Dual Stand-by (DSDS): both active; 2 signals, but only 1 call at a time
Dual SIM Full Active (DSFA) Dual SIM Dual Call/Dual talk: both active; 2 signals, and can process both calls at the same time. I think this one would consume the most battery.


UPDATE 2013-09-23: The answer to your 1st question is NO, as described in the quoted Wikipedia text above. For your 2nd question, I don't know, but I assume it wouldn't run since there is no SIM. Probably also the reason why it consumes lesser battery.