Weighing in at 235g and comprising a capacious 9,400mAh battery, the Enerplex Jumpr Stack 9 is a serious power bank; it was capable to charge our evaluation Nexus 5X almost three times finished off a single charge. At GBP90, it’s also seriously pricey, but it feels well made and it has great characteristics, such as built in, ruggedised micro-USB and Lightning connectors. There is also a typical USB port, and all three output signals could be utilized concurrently. Moreover, metal contacts on the top and underside of the Stack 9 empower you to chain multiple units together into an individual uber power bank.
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Given the capability and expense of only one Stack 9, nevertheless, you’d need to be an off-grid oligarch to find this feature useful. It is a terrific product, but quite pricey for what is essentially still a battery.