The BB Priv has a pretty nice stamina, if it is not too infested with bloat (mine is debloated).
Though some complains that a 3410 mAh battery is too small for a phablet with a 5.4″ QFHD display, it is enough for me.
5¼ days on 96% battery
This is with no trickery of radios off or similar. 4G, WiFi, NFC all turned on. GPS off though. ADD: BT off too.