Monster Cable Mobile PowerCard Portable Battery (Slate Black) (Discontinued by Manufacturer)

Extremely compact and portable. Very easy to use, just one button, intuitive lights show charging level. Well built unit. Revived my HTC One M8 from having no charge at all. A fully charged Monster Cable Mobile PowerCard Portable Battery managed to recharge my phone to about 50 percent of the battery capacity. Not sure, if there is any charger this size that could do more than that. So far, I have not found one. I am rarely someplace that an additional 50 percent charge would not hold me over until I can recharge again at home. All in all, I am very satisfied with this product.

If you have an iPhone, just make sure to also have a cord with you. The only cord included is the Micro USB cable (which it clearly says in the description).Update: I thought this battery was no longer able to hold a charge, and about to recycle it. After trying a few things, I discovered that over time the connection between the charging cord and the battery had become loose. The battery DOES recharge, but I now have to be very careful to ensure the cord is at a perfect angle, or it will not work. Still no problem when charging my phone from the battery.

Love these, I own 4 of them, and they go everywhere, just enough to bring the Iphone to 50% and still charge while running apps.

solid product, just be aware before you but it of what you want it to do. It is handy for a long day out with not access for a plugin. If you fully charge your phone every morning but run out by 5pm or so this product is great for getting you through the day. It's not a full charge, its just a convenient little boost to get you though the day. Do not expect full charge or even close. on my iPhone 6 i'll probably get around a 35-40% charge off it.

Lightweight, thin, yet carries enough power to instantly bring any phone battery from 0% to 65-75%.

had only worked intermittently. Seemed to loose a charge withing 24 hours of charging. Now doesn't work at all.

Have not use much

The charger does everything I needed it to do. It's by far the nicest wallet battery I have purchased. My only complaint is that the metal surrounding the USB port is bending inward.

Excellent gadget that performs well and fills a real need given how power hungry smartphones are.

Excellent service and response - good piece of kit - just needs a short instruction sheet

It is easy to use and small enough to keep in a handbag (not a wallet). Doesn't fully recharge my Samsung S3 but is a useful gadget when the juice is low.

Terrible, lasts half an hour and barely charges my iPhone 6, this product doesn't seem to be genuine. This product gets really hot when on charge, absolute waste of money

Excellent