Pros: i got this thing thinking i would never use it charged it used it once charged it again forgot about it till i moved been using it for a month still works great suprised i could just leave it laying around for that long still lit up 3/4 of the way

thing is great got it on sale for 10 bucks now its 50 i lucked out

Cons: since its making me put one i dont think it stops taking a charge till you unplug it maybe add that in future product

Pros: Good price when on sale (2 for $33, free S&H)
Great initial performance - full charge in about 3 hours, charged my Galaxy S4 from 20% to 100% in about 1 hour, and one charge of this battery was enough to charge my S4 from 20% to 100% three times; maintained charge for 2+ months in storage

Cons: After about 20 charge cycles, performance is miserable - in 12 hours of charging, battery went from about 25% to about 75%; doesn't seem to reach 100% at all; takes 2+ hours to charge my S4 from 20% to 100% and can only do so once before needing to be charged again.

Pros: Cheap, can charge multiple devices on a single charge.

Cons: Stopped working after 7 months.

Pros: Works great
Holds charge well when not in use
Can really put the charge on

Cons: Heavy
Bulky
Not that I didn't know that from the beginning...

Pros: Nice looking unit

Cons: Died in less than 2 months. The LED lights are not very intuitive nor is the on/off button.It simply just stopped working.

Other Thoughts: I would not waste my money on this product.

Pros: Small size, large capacity, aluminum body (not cheap plastic like others), durable, charges fast.

Cons: Somewhat heavy, a little bulky.

Other Thoughts: It could be a little thinner, but inside are 18650 batteries so that's why it's as thick as it is. Given that, if it ever loses capacity, it will be easy enough to fix by replacing the 18650 batteries inside (or possibly upgrading the capacity by buying higher capacity 18650's)

Pros: This item purchased as Shell Shocker. I wish I would have purchased 4 more. The capacity for USB power is very good. I ran my GPS for 20 hours with 50% power to spare.

Cons: none

Other Thoughts: I wish I would have purchased a few more- excellent value.

Pros: Well made! Worth of buying.

Cons: Just a bit heavy but that is just for the juice I think. so actually not a pro.

Pros: Solid construction, pretty good recharge times, battery level display

Cons: None so far.

Other Thoughts: I got this for my daughter because she was running through 2 charges or more a day. For the price ($10) if she killed it, lost it or it was downright junk I wasn't out much. So far, it's worked quite well and she carries it everywhere. It's pretty well built but isn't overly heavy. I actually bought a 2nd one just to keep in the car. If you can get one on sale it's definitely worth it.

Pros: Wasn't expensive

Cons: Never got to use it because it never worked

Other Thoughts: Seemed to charge up, but it didn't work the first time I tried to use it. Tried it on various phones. Useless. A waste of money for me.