can i charge LIPO Battery with normal mobile charger if computer is not available in field. please let me know.

Yes..I do that for my Syma X5C-1. I use a mobile charger with USB out to connect the cable. Be careful about output ampere. Ideally it should be 0.5 amp for a 500mAH battery and 0.6amp for a 600mAH battery. That's charging at the rate of 1C. But I have used upto 1 amp charger though it may damage the battery.

yup you can .. from your USB mobile charger

any specific mobile charger

u can use xiaomi mi3's  charger for 500 mah battery

I have a Xiaomi Redmi Note phone. I use its charger. Any decent USB charger which produces stable output will do.