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The Jumpr Stack 3 is a pocket sized device that can provide charging facilities to a range of digital units whether they belong to the Android, iOS or other fraternity.  Decked out in a combination of black, grey and orange, the Jumpr Stack 3 has dimensions of 105 x 68 x 14mm (H x W x D) and weighs 120g and so should not over-burden the user too much. At its heart is a Li-Polymer 3.7V 3200mAh battery which has a rated recharging cycle of 600 cycles.

Included in the box with the main unit is a standard-to-micro USB lead which can double as the means to input power into the EnerPlex device and transfer that power to any attached mobile device.  Standard and micro USB ports are positioned along the bottom of the Jumpr Stack 3 unit.  Along with the separate USB lead, the Jumpr Stack 3 also has a couple of permanently tethered connection leads.  On the left is a lead with a micro USB connection while the lead on the right supports the Apple Lightning technology.  These rubbery tethered arms slots back into grooves when not required so as to avoid the risk of being damaged or take up extra space.

See also: Chargers

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Completing the package is what could be best described as a mini Quick User Guide.  Maybe I am a little over-sensitive, as I am currently adapting to a new pair of vari-focal glasses, but I do not think so, regarding the font size used in this document.  I quickly needed to reach for a magnifying glass so that I could check out the product’s instructions.  Product manufacturers need to appreciate that not everybody has young eyes with perfect vision and produce documentation accordingly.  You can download and print out the product’s User Manual and this does have a larger font size.

When charging the Jumpr Stack 3 device you need to connect it to a power source via the micro USB port.  Four LED lights across the top of the EnerPlex unit provide feedback as to the battery level status.  The charging operation can be rather time consuming.  My unit had arrived in a partially charged state.  In my case there were three solid and one flashing light indicating that the battery level was between 50 and 75%.  Just under three hours was required to bring the device up to full capacity.  Later a full recharging took 5½ hours before four steady lights appeared. A power button of the top front of the unit can be used to check the battery level prior to charging a connected device.  During the process of charging an attached device, the LED lights will blink slowly to provide feedback as to the battery capacity still available.

I found that positioning the EnerPlex unit when charging certain devices could be a little awkward.  One example of this was when charging a Google Nexus tablet.  The short length of the tethered lead and its rubbery nature gave very little flexibility with regards to positioning the two elements side by side.  Fortunately you do have the option of switching to the supplied USB lead which can be connected to the standard USB port on the bottom of the unit which I found far easier to use that the tethered option.

The Jumpr Stack 3 possesses a feature I have not seen in other battery charging products I have tested.  Explaining the “Stack” part of the product’s name, the Jumpr Stack 3 has a “Stack ‘n’ Charge” function.  If you possess more than one of these devices then they can be stacked or piled on top of each other so increasing the amount of battery capacity at your disposal.  Up to four units can be stacked with contact being established by three charging connection points on the front and rear of each Jumpr Stack unit.  Unfortunately, as I only possess one unit, I have been unable to test this feature.

Pricing for a single Jumpr Stack 3 unit has been set at £59.99 which could put off some prospective purchasers.

http://www.goenerplex.com/products/all-products/jumpr/jumpr-stack-3