I bought one of them hi-tech chargers this week.
I bought it at NAPA .....Charge IT is the make/model?......go figure.
It was the only one at NAPA that specifically mentioned AGM capability......and it was the cheapest @ about 60 bucks......Those AGM batteries will change everything you thought you knew about charging.
It works fine for the AGM battery and claims to do the job on any type automotive battery. Sure, the name is funky, it looks funky, & weighs about 1/3 of my old charger......but it works.....it's got all them hi-tech flashing lights, LEDs, and buttons to push.
The deep cycle battery ain't a bad idea and you could probably shut the car down in the lanes, then restart without a problem.....you'd have to find the limit. I always shut down but I had an alternator keeping the PC680 up to snuff....
Adding 30 odd lbs to the overall weight goes against the grain for both of us. An alternator and fixens' weighs less than that, me thinks. A lot more work tho.
Just make sure the beast is tied down well....if you can find something solid on your car.....that battery would tear your car apart if it decided to leave the building.