Change of employer in India with approved I140 and H1B?

[sada2016]

I am with a employer 'A' who is holding my approved H1-B and I140. My H1-B is going to expire in March-2017(filed an extension) and my 6 years will end in April 2018.

What if I go back to India and change my employer? Will my existing I140/H1-B of any use?