1. The TOTAL output of the product is 3.1 A (A for ampere, mA is milli-ampere and 1000mA = 1A) at 5V. Since, all ports are at 5V output, here on if I refer to the current ratings in A or mA, the voltage is by default 5V.
2. Each USB port has different current ratings, the 5 ports in this product have: 2.1 A, 1.3A, 1A, 1A, and 0.5A.
---So, as you see, the sum of all the 5 ports is 5.9 A (2.1+1.3+1+1+0.5), but you do not get it because the total output is 3.1A
---You can only use combinations of ports that will give you a sum of 3.1A or lower. For example you can use the ports 1A + 1A + 0.5A ports which is a total of 2.5A, but you cannot use 2.1A + 1.3A which is 3.4A and greater than 3.1A.
---Heres an exception, you can use use combinations of greater than 3.1 A but it will be really slow in charging you devices.
3. DO NOT PLUG YOUR DEVICE INTO ANY PORT YOU LIKE!!! You need to have the info for the devices you are charging. Look at the wall charger adapter and it will have the ratings, the voltage is typically 5V, and the current ratings will vary. iPhones are 1.3A, tablets typically 2.1A, andriod phones around 1A and cameras 0.5A. My HTC inspire is 850mA or 0.85A. Typically you do not want to plug your device to a port with higher current rating. So, I should not be plugging my HTC Inspire to the 1.3A or 2.1A. The 1A ports are OK as it is close to 0.85A and will not harm my Inspire. You may however use a lower rating port, if I plug my Inspire to 0.5A port, it takes hell lot of time to charge. If you connect a tablet to the 0.5A port, it is going take forever to charge.
So, do your math and use the Portabl power bank wisely. The product is great, the only downside is that it is heavier than I thought, but that should be expected as it is giving 5200mAh. The best highlight for me is the 5 ports with different ratings and covers all my devices, also the size is smaller and easy to carry around.
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