What model eMTA should i have?

Just wanted to know,  what model eMTA modem is comcast Business using?

What model are you guys using?

Just wondering if I have the wrong model?  Maybe a Res model?

( Using now , Arris TM722 )

( I made a mistake and changed out my old TM702 eMTA ( bad ) at a comcast center.

They gave me a TM722)

Comcast Business sent me a battery for a TM702g.

I'm going to call and see if I can use it or not.

I plugged it in, and after 1 hour. It was really hot.

I took it out. I don't want to damage the eMTA modem.