Lead acid = hydrogen
AGM = no hydrogen

No hydrogen = no explosion

At least that's the way I look at it

Nothing ruins battery faster than overcharging. Even if no explosion. One winter will kill it. Store in a cold place fully charged and you are good.

not all chargers will work with AGM

I did too! I charged one of my truck batteries due to one of the guys leaving on the dome light. Got a call from the warehouse manager that my unit was on fire. Was a nightmare, lost my tools, computer equipment all kids of stuff. Was a Schumacher battery charger.

NEVER EVER again will I charge a battery unattended. At first I thought it was the charger from a Ryobi drill but the fire chief showed me the burn marks all around a wall and said "what was here". I said a "car battery and a charger"

Want to know the best part? It was 10 feet away from my acetylene torch. That would have been really nice! Could have killed a firefighter. Piece of scjit Schumacher charger.

so much now is junk from china...and they don't care what happens here...idiots can't even make a good fortune cookie !!!

I won't leave a battery on a charger overnight !

A charger that shuts off after the correct voltage is reached shouldn`t cause any damage unless that battery is bad.
I leave my truck and 3 boat batteries in the boat on a good trickle charger.
I did have a bad battery one time that I left on a regular charger and it was smoking and bubbling , looked like ready to blow..

Thats what I thought...

On the other hand, a battery that gets rocked around and launched off 6 foot waves might end up with a few problems.

I'm glad this post came up - reminded me to go unplug mine.

I have always used the digital chargers for years and never had issue. And I'm leaning toward a bad battery issue and possibly switching out to the AGM batteries. The charger company did say they would check out this on-board charger for me, they claim they never had a issue. I was told by one person and seems like a good idea, put charger on a timer to come on once a month for 1 hour. Any other thoughts on this idea?