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Difference lead acid battery and closed lead batteries + interchangeable chargers?

I found a 6v closed lead battery as found in UPS systems. I'd like to get in in condition again and found a schematic for a charger/revitalisor for motorcycle batteries. But those are open batteries, and I found chargers specifically for that type somewhere as well. Could I use it anyway or is that a bad idea?

There's not much difference, apart from charging rates. Open cells will accept faster charges, at the cost of reduced life. Sealed cells won't really like fast charges, because they'll try and vent.