7. Lenovo Vibe Z2 Pro – 4,000mAh

Well, if Lenovo K80 is the only model packing 4GB RAM here, Lenovo Vibe Z2 Pro is the only packing a Quad HD display measuring up to 6 inches. Moreover, its rear-facing cam can be the best in the list as well thanks to being capable of 16 megapixels with f/2.2, OIS, autofocus, plus dual LED flash. Meanwhile, the front one is standard with 5 megapixels. Other Lenovo Vibe Z2 Pro specs are a Snapdragon 801 quad-core 2.5GHz chip, Android 4.4.2 KitKat OS (upgradable to Android 5.0.2 Lollipop), 32GB of non-expandable ROM, 3GB of RAM, and a 4,000mAh battery.

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