Which Apps Are Draining Your Smartphone Battery the Most?
Google is tops, according to Uswitch, followed by 3 from the Facebook family

The top 10 apps require access to a combined 422 permissions on smartphones
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The Google application takes the largest toll on smartphone batteries, followed by three apps from Facebook—its flagship app, Messenger From Facebook and WhatsApp—according to a new analysis from U.K.-based comparison website Uswitch.