Gel batteries are sealed, and shouldn't under most conditions expel hydrogen. This is part of why I got one, the other reason being no water level issues.
So, you should be able to safely just plug in your converter if it's 3-stage, and be done with it. But, I don't think the 2005's had 3-stage converters, so an upgrade may be in order...
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2009.5 2720SL
2006 Toyota Sienna
2018 Audi Q7
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