BatterySamsung Galaxy Grand has a normal 2100 mAh battery, which, officially, provides 610 minutes (10 hours) of talktime over 2G/3G networks; while the standby time is 440 hours. It gets charged fully from scratch within one hour, but can hold on to that charge for a very long time. Unlike any other smartphone, we had kept the WiFi hotspot on for around 4 hours and played games for another 45 minutes.
Still the phone lasted for another 12 hours. This is incredible for a smartphone. With normal usage, involving 2-3 hours of music, an hour of WiFi/mobile data usage and another hour of gaming, the Galaxy Grand can hold on to the charge comfortably for a day or more.