This is E4 multi-function digital movable 18650 battery charger box.
With features Double USB output, SOS, LED flash Light
LCD display show charging progress.
Is your phone, tablet, or laptop on its last legs before day’s end? We’ve tested scores of power banks to tell you which ones will give you the biggest boost when you’re out of juice.
Read our roundup of the best portable chargers and power banks of 2018 right here!
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