High quality Power banks rated 20,000mAh capacity (18,000mAh useable).
3 months unlimited warranty.
Constant energy density across complete discharge cycle.
Life cycle: 1,000 to 70% ( If you charge it full and then completely discharge it daily, it will take 1,000days for the rated capacity to drop to 70%).
*Buy a power bank, not a flashy packaging of inferior products