Juice 20000mAh Portable Power Bank Max review - Which?

The Juice 20000mAh Portable Power Bank Max has two USB outputs, which means it can charge two devices at the same time. Unusually, you give it a good shake to find out how much charge it has left, but gimmicks aside, does it operate efficiently and quickly? Our expert tester provided the answers. Read our full review for their verdict.

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