This is very informative and useful if you read and scroll down.
Dennis 69 OTS
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My question is how do you tell whether a charger is a for wet or gel?
Gels require a slightly lower voltage so there can be a setting. See the AGM option on the charger photo attached. In the photo the option is for wet cell motorcycle, wet cell car, gel and then a recondition mode that helps desulphate the batteries lead plates
Dennis 69 OTS
My 50 year old Sears Craftsman charger doesn’t have that option.
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I have two. O e about 8 years old and it may, but the other is 30 yo and likes yours doesn’t
Yeah, my older unit was not that old. Schumacher. A friendly tech there explained the difference. Sold the old for almost what I paid for it. It looked and functioned as new. Bought a “Smart” charger. Schumacher also. Works swell. No gel batteries around now???
A dumb charger can be "fooled"in to charging a gel
Use a discharged lead acid, in series between the charger and the discharged gel unit…
Never needed to try that. read of it here, decades ago!!1
Carl .