Actually, a great tablet - but the battery charge function is defective with me

Have the Tablet ordered and promptly get delivered - great Amazon service!

The first impression (it's my first tablet):
- For me the ideal form factor, not too big and not too small (A4 pdf's can I still so present, I can read well they zoom around with little).
- Great connectivity - Wi-Fi, telephony and data (with FONIC prepaid), USB, plus SD card everything works just fine.
- Screen for me in resolution and brightness OK.
- General speed (do not play games with it) fits my application - mail, surfing, Office (Word and pdf) no shocks or other delays noticeable.

However, I had the tablet now first return and hope to receive a functioning Tablets due to a defect.

the background:
Have the tray with about 70% battery charge level and get it then wanted to try immediately. I have to manual insert the SIM and in addition ordered SD card and turned on the tray.
The establishment of both cards has super easy folded - telephony and data on my prepaid provider FONIC set ultimately worked automatically - so it was great for a tablet novice like me.
For about 20% battery level I The tablet then turned and wanted to charge it overnight with the enclosed USB charger and cable. The manual recommends so that you turn off the tablet during charging or not to use.
Although I mean other devices (laptop and cell phone) to load actually not necessarily specially turning down - and thus far never had any problems - I have once made here, after so noted in the instructions that the beautiful the battery.

So, the next morning shone the red charging lamp is still what puzzled me ever. Did it then turned and to my surprise 11% battery Ladestand- Häää !!! so what I have indeed never experienced "negative" charging.

Did it then 7 hours - but turned not used - tries to continue charging, but no positive effect.

At 7% battery level I have to load it to the factory settings and still tries (again 6 hours).

Now with 4% battery charge I grab it, and send it back to be defective - hope that the replacement device is working in terms of battery charging and then not about other errors.

Then I forgive even 5 stars because the device is super otherwise my feeling and impression so far especially for the price.