Best deep cycle ?

Skid Row Joe wrote:

Lowsuv wrote:
Love the AGM
i bought 2 for my duramax , group 78 , for $140 each at BiMart.
Exide EDGE AGM , made in the USA .
Our mercedes has a group 49 AGM as standard , six years old now .
It is in the trunk .
The AGM will recharge faster which is important to me as i live in a town that only takes 15 minutes to go anywhere .
AGM life is 150 % better than conventional .
We dry camp and use our duramax AGM hooked up with # 2 jumper cables to our 2 FLA group 27 .
We just let the 4 batteries equalize with the jumper cables .
no genny , no solar .
no corrosion with the AGM .

What is an AGM battery?

Does Interstate sell one?

Thanks......just trying to learn about the various batteries here.