as the owner of a Lumia 920 one knows the problem, every day having to 1-2 times to the charging socket. Straight to work where I am sometimes a lot, the Brando Power Jacket, a sensible alternative would constitute the charger.
Firstly the good:
The Power Jacket allows you to load the mobile phone within 3 seconds or remove. The mobile phone itself, sits absolutely firmly in Case. All pins are still easy to operate.
What I did not like so much:
The mobile phone looks much thicker with landscaped Case. Before ordering, I have looked at several video clips on the Internet, after which the case will make things even greater (realized how should it go otherwise), but the depth is nevertheless already clearly than assumed. My wife called the Lumia with Case affectionately called "chocolate" or "wallet". That hits pretty well I think. So carry with Case in the front jeans pocket, is inconvenient and also looks very strange;)
But what absolutely did not work:
... Is the mAH incorrectly specified. In fact, Brando provides only 1650mAh. These are just 75% of the promised capacity. And this can only be achieved when the phone is not in use (and I do not mean in the mobile network or WLAN pending) is.
My test scenario: let cell phone idle. In Case Insert, Switch Case, display the phone off so that no power is consumed. After the last indicator light turns off when Brando, turn on the display again, enter your PIN, leave login mobile phone and read the mAh value with various tools. This test I conducted with three different Brando Power Cases and two different Nokia Lumias performed 920. All three have brought the same result. If the phone is registered and "normal" used during charging, the user notices no 50% more load capacity.
Conclusion:
For the price, the performance is not enough. Then just think about it a wired mobile spare battery or if that is too sensitive (yes you can cancel at movement) the internet for a mobile wireless solution search.