eFreesia duo - Portable Smartphone Tablet Battery Power Bank Charger with Built-in USB Cables
Meet the all-new awesome eFreesia duo! The best ally for a defense against keeping your phone always fed and ready for action! The eFreesia duo, is about the ...
The Lumsing battery pack is the smallest portable 5200mAh unit that I've
seen yet, so I was initially a bit skeptical of its capability. I tested it
with my Kindle Fire HD 7"" (1st generation), which has a 4400mAh battery. I
first charged the Lumsing with an AC wall charger until all four LED charge
lights were on, then I connected it to the HD, which was indicating a 55%
charge. After 130 minutes, the HD was at 93% (an increase of 38%), and the
Lumsing was showing three LEDs. Theoretically the HD had drawn 1,670mAh
(4400 x 0.38) from the Lumsing, leaving about 3500mAh in reserve, or about
67% remaining charge, which is consistent with the 3 LEDs (50%-75%
remaining charge on the Lumsing). That doesn't consider the loss of
capacity due to electrical inefficiencies in both devices, but the numbers
are consistent enough to demonstrate that the Lumsing was charging the HD
and registering correctly on its own charge indicators.