The most fun Killer of smartphones is still the battery. After less than a day of intensive use an electrical outlet is generally necessary. Therefore, it is a pity that Samsung has greatly saved the Galaxy S4 on battery. For me, like a balloon has bloated to three months of battery and impossible normal use. The provided by Samsung replacement battery has had more after about half a year no power and the battery indicator became one every minute countdown. In standby mode the current was faster way than you could see. That is why I have now waived the Samsung genuine parts and chose the mumbi replacement battery. A very good decision! The mumbi battery can be used without any problems and it works well. The additional 300mAh play their part to ensure that the battery will last a little longer. This affordable battery ensures more mobile fun and is highly recommended, even if you have no problems with the Samsung original battery!