Pros: I was impressed that this portable backup battery carries a 14000 mah battery capacity within a reasonable price, it is extremely powerful source to keep my usb recharged device and smartphone operating on those long work days and while I am traveling to New York. It charges my iphone really fast, and giving my iphone almost X 8 times juice, nowadays I am no longer need to worry about my phone battery because I got this little sucker to backup my phone battery. Here is a brief merits of this product: 1. Large capacity 2. Duo USB charging ports (allowing me to charge 2 devices at the same time) 3. Durable 4. Fast Charging 5. LED flashlight 6. Portable 7. Great for trips, camping, and gift

Cons: None that I have found as of now, except it is kind heavy but bearable. I am probably doing another update of the device performance to share about this product. So far, I would recommend this product to anyone.

Pros: I was impressed that this sleek design backup battery carried 14000 mah capacity to keep my usb recharged devices operating on those long work days (it did last few day if i used to charge my iphone). So far I used this battery for two weeks, and i couldn't be happier with it. Here is the merits of this battery pack after I used for two weeks: *Durable *Fast Charging *Large Capacity * Duo USB charging ports * Portable for (trips, camping, and shopping) * Has a bright LED light * Kind of heavy but is bearable * Able to charge two devices at the same time without worrying about not enough juice. * Reasonable price

Cons: None that I have found as of now...... I will be doing an update after 1 or 2 month to share the device performance. Now, I would recommend this product to try it.

Overall Review: Tonight i am having a crazy idea, where i want to study how the lithium battery arrange inside, and the chip connects with the usb outlet. Thinking of how can I adjust the output, so i would charge the phone faster. After few more minutes, i stop because I am not going to risk of my money. hahaha