Who's running an AGM battery in a weekend driver?

YY1 said
The yard sale Schumacher 15A charger I bought last month has an AGM mode.

Can you use a "regular" (non-AGM mode) maintainer with an AGM batt?
What about the "slow" charge rate on a regular changer?

Ive heard that to do that you need to hook the charger to a wet cell and paralell it over to the agm.