For my purposes, not enough

A small power gain is noticeable in my Samsung S4, but actually negligible. The hope, though with various power saving settings, but with Wi-Fi and so constantly to the need to charge the battery only every 24 hours, has unfortunately smashed. Since it must be already more mAh well with the disadvantage of increasing the outer shell, which I did not want to accept.

Mini-microfibre cloth? Wrong!