4 batteries in the test

I want to share my experience with 4 external battery for the iPhone 4 with you:

There were tested:
Just Mobile Gum Pro
Just Mobile Gum Plus
RAIKKO USB AccuPack 5200
ZNEX Power Pack 5000mAh

Test sequence:
1. Battery 2x complete charge and discharge, so that it can develop its full capacity, only then carried out the charge of iphones
2. Always iPhone from 0% to 100% or loaded as far as possible

A. Just Mobile Gum Pro 40EUR
Charging cycles: 1.7x

per:
small, handy, convenient

Cons:
inaccurate LED charge status indicator
low capacity
will not charge if iPhone is completely empty
Compatible> not really with iPhone 4 -

Verdict: iphone4 recommended good, but not for Use

B. Just Mobile Gum Plus 65EUR
Charging cycles: 2x

per:
accurate charge indicator, small, handy
also loads of charge status 0 starting

Cons:
expensive

Verdict: top, my personal test winner

C. RAIKKO USB AccuPack 5200 30-40EUR
Charging cycles: 2.2x

per:
accurate charge indicator
largest battery capacity in the test
also loads of charge status 0 starting

Cons:
unwieldy as plug protrudes laterally on the unit, and with the required adapter's is quite bulky

Verdict: price / value for money

D. ZNEX PowerPack 5000mAh 50EUR
Charging cycles: 2x

per: Hmmm, I do not find much to a (at least in connection with the iphone4)

Cons:
inaccurate charge indicator
invites not charge status 0 starting
interrupts charging several times (when the iPhone charging current briefly back controls), and plug it helps
Compatible> not really with iPhone 4 -

Judgment: Most boring product in comparison