From Varta I expected better ...

So I acquired in September 2011, the product "Varta Power Play LCD Charger m. 4 AA (2700mAh)" and now extensively tested.
Now for my impressions gained:
- Even the supplied batteries are sometimes not recognized.
- It often happens after about 5 minutes of charging for the error message (battery indicators are flashing)
- Batteries from other manufacturers are virtually never identified or charged properly.
For all the above problems, it does not matter if it is 2 or 4 batteries.

The problem with the supplied battery can be repeatedly then insert eventually resolve.
The batteries are fully charged and then are very persistent.
I use it for my XBox360 controller and then can play up to 15 hours without problems without problems.
The time value of 15 hours is. Of course not consistently meant.
Charging takes about 2.5 hours and is then compared with the uptime better than me.

Conclusion:
+ Long battery time
+ In relation to short duration of the charging process
+ Clear display

- Often error message (see above) even with the supplied battery
- Batteries from other manufacturers are not detected to 90%

Due to the frequent charging and recognition errors I give only 3 Stars.
But I think that I will exchange the unit and hope that the problem described by done.
Should this be the case, I would give the product "Varta Power Play LCD Charger m. 4 AA (2700mAh)" 5 stars.