BatterySamsung Galaxy Grand duos has a 2100mAH battery which is enough to cover a full day of intensive use of this device. With regular use the battery can last about 1 to 3 days. For intensive use of the device it will last about one full day. The standby time of the device is about 2 to 3 weeks.
Sony has packed the Xperia C with a 2390 mAh battery which can easily withstand a full day performance. The device also has a battery stamina model which dramatically extends the battery life by automatically cutting of syncing of apps when the device is idle. The stamina mode also cuts Wi-Fi and data traffic to extend battery but will not hamper calls, texts, alarms and the music player.