Samsung B310 comes with 800 mAh battery. But it is very efficient. You do not require to charge the phone for almost 3 days with moderate usage.
No. This is without camera samsung feature phone. Guru Music 2 do not have camera.
No. This phone do not have wireless FM functionality.
Samsung guru music 2 B310 comes in 2 different colors - Blue and White
No. you can use whatsapp in this phone.