2. Asus Zenfone Max

Hitting the shelves earlier this year, Asus Zenfone Max is still the phone with the most powerful battery among the best Asus Zenfones on this list. With 5000mAh capacity, Asus Zenfone Max battery allows up to 20 hours of talk time. Other Asus Zenfone Max specs are also amazing: 5.5-inch full HD display, quad-core 1.2 GHz processor with a Qualcomm  Snapdragon 615 chipset, 16GB of ROM (64GB expandable) and 2-3 GB of RAM. This Zenfone also offers fairly good camera: 13MP on the back and 5MP on the front, both featuring great technologies. Asus Zenfone Max price is $150 for the 2GB version and $190 for the 3GB version.

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