Kindle 3 (WiFi) battery dead!

I have a kindle keyboard for 2 years now and suddenly last week the battery dies and the screen stays at low battery screen. When I try to charge it the orange light stays for 5 secs and then it goes blank. I have tried to reset it via button and have also removed battery for 10 mins but it doesnot charge.
I tried searching online for new battery but nothing is available in India.
Can someone help me get a new battery?