There is not a lot that sets auxiliary batteries apart. A few more amps here, a few more USB plugs there, and that’s about it.
Digital Treasures, though, has taken the trouble to gussy up the basic battery, putting 13,000 mAh of lithium-ion power into what appears to be a flask.
Called the Power Flask, the case has a flask’s distinctive curve, for discreet pocket storage, and leather trim with red stitching. The end caps are chromelike polished aluminum.
The Power Flask, which retails for $90, has two USB ports, one supporting 1 amp charging for phones, and a second supporting 2.5 amp charging for tablets.
You can charge more low-demand devices at a time, though; two phones can be put into the 2.5-amp slot using an included Y cable, and another can be charged from the 1-amp slot for a total of three devices at once. The flask also comes with two 30-pin adapters. If you’re using a Lightning connector, you will have to supply your own.
The flask has blue LEDs to indicate he charge level and twin white LEDs on the top that work as a flashlight.
