Sony NEX-6 new user... Battery pack + charger recommendation?

Hello everybody! So, my NEX-6 is already on my hands (received yesterday along with Sigma 30mm f2.8) and gives me a lot of fun... See sample below...

HDR painting: Mid

I know that it was discussed some time ago but... I need recommendation for "Battery plus charger pack", but please PROVEN for NEX-6. Since there are rules for "Commercial advertising",  please send it to me as Private message.

Thank you in advance!

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Yuri Stangrit
http://natalispalette.jimdo.com/new-and-old-camera-lenses-by-yuri-stangrit/