Is this battery a direct replacement for a factory group 65 AGM?

Yes. Group 65 is the physical size and terminal layout, so it drops into vehicles that came with a group 65 battery. Check that your car specifies AGM rather than flooded, since charging profiles differ.

Does an AGM battery need a special charger?

Yes. Use an AGM-compatible smart charger. A conventional flooded-battery charger can overcharge it and shorten its life.

Will it work in a car with start-stop?

AGM is the chemistry start-stop systems are designed around, so it is the right type. Confirm the group size and cold cranking amps your vehicle calls for.

How is it different from a flooded battery?

The electrolyte is absorbed in glass mat separators, so it will not spill if tipped and it cycles better. It also costs more and weighs more than a comparable flooded battery.

Can I install it myself?

Yes, on most group 65 vehicles it is a straightforward swap with a wrench. Disconnect the negative terminal first and reconnect it last, and check whether your car needs a battery registration reset.