Remote control not working, please help

[Wibs]

Hi, I have an 08 H2 with the rear overhead entertainment video screen.

The problem is the remote, it doesn't seem to work, and I have already install a new battery.

I disconnected the negative post from my battery during winter season in order to avoid draining my battery.

Since I disconnected my battery,is it possible that the remote lost its connection with the overhead video screen ?

Any thoughts ?

Thank you.