A recently rumored BlackBerry device has been tipped by leakster Evan Blass to have a hefty 4,000 mAh battery in store. The device in question is the BlackBerry Ghost - a high-end and supposedly bezel-less BlackBerry device to be released exclusively in India. Its existence was first leaked in February and it is slated to be released sometime in the summer. Batteries this large are almost never found in flagship-level devices - batteries this size are usually seen in mid-tier handsets. Apparently a battery this large would be among the largest in a flagship-class device - which says a lot...
Source: https://www.gsmarena.com/blackberry_ghost_might_have_a_large_4000_mah_battery-news-32095.php