To ascertain the state of the battery, it has a button on the side lights up blue LED on the top of housing (4 between 75 and 100%, 3% between 50 and 75, 2 between 25 and 50%, 1 5 to 25%, 0 to below 5). It's convenient and allows to quickly view the state of charge of the battery. In feeder mode, the battery has 2 outputs, 1.5A and a so-called fast-charge or fast load 2.1A. This allows to quickly load their devices even if larger batteries such as those tablets will not charge as fast as on the sector (even constant over all the batteries tested). On my Alcatel One Touch Idol mini, charging is fast and the battery allows five full recharges. The battery also provides a full charge a 10 inch tablet. Obviously, everything depends on the ability of the battery to be charged.
Finally, aesthetic, the battery is rather successful on my model in black and orange on the sides. And to break up the austere black, long orange stripe separating the housing 2 over the entire length of 2 sides (barely visible on the first picture). It is very thin and more elongated than others I have had in hand. She environ13,2x7x1,6 cm to 232 grams. It therefore allows to slip easily into a bag to fill his battery backup role.
In summary, it stands there a good battery, nice look and with a very high capacity to recharge any device.