InfoLITHIUM - Sony's "smart" lithium rechargeable battery pack. It has a chip inside that tells the camera how long (in minutes) it will last at the current discharge rate.
Sony NP-FS11 InfoLithium 3.6V 4.1Wh
(1140 mAh) ~ 70 mins recording
Sony NP-FM50 InfoLithium 7.2V 8.5Wh
(1180 mAh) ~ 110 mins recording ...
At best they display icons that tell you when the batteries are fully charged and when they are almost depleted, but don't tell you much in between. The exception is Sony, whose infoLithium® batteries communicate their status to the camera so it can ...
 See also: Lithium, Battery, Camera, Digital, Display
  
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