iPhone battery life compared to Androids

a couple of coworkers complained lack of battery life androids.
1 had galaxy s2 has plug in.
has, think htc, , purchased number of spare batteries , saddle battery packs can swap around day , put in chargers.

have plain 4, , can go 2 days normal usage (3g off time).

mentioned them turning off 3g, neither did not know if turn off 3g on android.

of course 4s more power intensive, how bad compared others?

 

battery life on android varies, really. people have battery life, have bad.

 

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