Emie Power Blade 8000mAh
We were in awe of the Power Note’s premium aluminium alloy design, with its unique binder holes along one edge of the ultra-slim power bank used to effortlessly secure it into a ringbinder, and its handy builtin Micro-USB cable (see above). The Power Blade features those same binder holes along its left edge, and while it lacks the built-in cable you do get a felt case for protecting it on the road. A handy front pocket lets you also carry the supplied Micro-USB cable, along with a pair of headphones or whatever you like.
The Power Note is slim at just 7mm, but Emie claims the Power Blade is the slimmest power bank in the world at just 5.2mm. It’s a little larger than the Note, given the increased capacity available, but it’s remarkable how Emie has achieved such a thin-and-light design.
To connect a USB cable, you must first push forward the top edge of the USB output to slide out the metal casing and enlarge the port. Both USB outputs are specified at 10.5W (5V, 2.1A) for fast charging of your connected devices, and the Power Blade offers adaptive charging with one port optimised for iOS devices and the other for Android and other devices.
With 8000mAh on offer, and an average efficiency rate of 70 percent for most power banks, expect to find at least 5600mAh available for charging your phone or tablet. That would provide our Samsung Galaxy S6 (2550mAh battery) two full charges with some power to spare.
Four LEDs are activated at the press of the small power button to show you how much juice remains. When the power bank is empty, the Emie can refill its own battery at 10W (5V, 2A), given a compatible charger (you can use whichever adaptor came with your phone or tablet). We found the Power Blade was able to simultaneously charge itself and a connected device.
In passthrough charging mode, we needed to press the power button to begin charging our S6, but when the Emie was not connected to the mains, it was a case of plugging in the device and the Power Blade sprang into action. However, while there is auto-on, there is no auto-off. You’ll need to unplug your phone or tablet once charging has finished to ensure no power is wasted. This small power button can also be held down for three seconds to put the Emie into adaptive charging mode.
The Power Blade is expensive for an 8000mAh power bank, but we think it’s worth the outlay with a unique thin-and-light design, dual-output adaptive charging and high-end features such as passthrough charging.