The battery pack (not seen unfortunately in the photo) is slightly higher than the standard battery (notebook is about 2cm on rubber feet higher, however, which leads to better and more pleasant position on the keyboard), it shows me my windows at normal student usage (read mails, Word, etc.) a battery life of over 10 hours - twice as long for the standard battery with 5200mAh ... That sounds good times. (Have a Samsung NP-RC530 Soede ...)
Expectant testing now just on time ... but the first charging and usage was ever any problem ...
And one more thing: How many batteries does this also a measurement function, so you can read the current battery capacity without notebook ...
Overall, therefore, can only be recommended!