This is nice phone by Micromax having 4000mah battery it is very difficult to find in this segment also company provide LED light with this mobile you can use this LED light for your study 4000mah battery work as power bank.
dual SIM (GSM+GSM)
2.8-inch (7.1 centimeters) display with 320 x 480 pixels resolution and 206 ppi pixel density
0.3MP primary camera
talk-time of 9 hours
standby time of 120 hours
10.7 x 1.6 x 4.6 cm
1 year manufacturer warranty for device and 6 months manufacturer warranty for in-box accessories including batteries from the date of purchase