Read more about the Nikon 1 J4.
10 April 2014 5:01 am BSTUpdated: 10 April 2014 5:01 am BST
Photo by: Aloysius Low/CNET
/ Caption by: Lori Grunin
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Is your phone battery always at 4 percent?
These battery packs will give your device the extra juice to power through all of those texts and phone calls.