What is the best external battery pack for the rezound?

[zazan]

I need an external battery pack and I want one that is actually directly compatible with the rezound.

I tried the verizon version which is a Motorola and it is crap; it couldn't even charge the phone 50% before going dead itself. A friend who has an iphone has a pack that gives him 2-3 full phone charges. Now I think that the rezound may be a bit more demanding but I don't know for sure. Also the rezound has a unique connector, so some of the battery packs don't directly connect and I would need to carry the cord with me.

Any advice will be appreciated.

 

[Harry2]

I use 'JustMobile Gum Pro', 4400mAh battery capacity and 120 grams weight.

It charges my phone's 1580mAh battery about two times.

But its main advantage is, that you could use the USB cable which came with your phone for charging your phone.
So the phone's unique socket will not be an issue.

And the charging is as fast as with wall charger with came with my phone.
For that rapid charging other mobile chargers need a special adapter/cable.
And a special adapter might be an issue with your phone's unique socket.

Harry