This battery is designed to enjoy optimum performance with your Samsung Galaxy S4 mini handset. With it your device will be powered longer and the battery will sustain a greater amount of charge.

 
This
Lithium Ion (Li-Ion) replacement battery from Samsung is always
guaranteed to charge to the optimum level. The battery case mould is
elegantly styled and great care has been taken to ensure that the design
from the original handset is matched. This replacement battery has been
manufactured using only the highest quality cells. 

The
battery life of a handset can vary greatly depending on how you use
your device and your battery charging habits. If your device is running
out of battery quickly， or takes a long time to start up (or even does
not start up at all)， then you may need a replacement battery.