I have a Schumacher speed charger 2-8-12a that has settings for flooded and agm/gell, I’ve had it for all but 15 years now and other than it’s cooling fan squealing when it’s below freezing it works great.
For my Cummins I have a 8a deltran that’s as old as the Speed Charger. It’s doing great as well. The deltran is waterproof. I was going to mount it in the engine bay but never did.
I also have a few Schumacher 2a tenders for motorcycles.
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