on 12 June 2014
Since it's suspiciously lightweight, I opened it up and there were only two thin LiPo cells inside. No markings, covered in sticky tape, and as bare LiPo batteries are soft and fragile, I didn't explore further. However, I estimate there's probably 5000 mAh in there, max.
The pack does work, though. Just not as advertised.
on 21 June 2014
The unit looks good - but as mentioned on a previous review, the minute I held it I knew something wasn't right. I have a similar Power Bank @ 8000mAh and it weighs nearly 3 times has heavy yet holds storage nearly a third less than this one advertised as 30,000mAh.
Once tried, it was clear - I was lucky to get one full phone charge (approx 2,000mAh) out of it when it was fully charged.
This is basically a tin box with a small rechargeable battery in - its not 30,000mAh - no way - unless the Chinese have invented a mass production light weight rechargeable battery capable of mass storage for a few quid.
Advice - steer clear and focus on similar ones which claim to be 5,000 - 10,000mAh... You stand a good chance of actually getting a product as described/labelled. Also - Remember - the size of the solar panel - the solar is for trickle charging the power bank only - don't expect to charge your phone or power bank by leaving it in the sun for a few hours. A few weeks, maybe :-) This applies to all products of this type.