[mrlmd1]

GZ250 -- Gel batteries are not the same as AGM's. I don't think anybody makes a gel in this small size, they are very expensive compared to lead acid or AGMs and there would probably be very little market for them.

To ER and alantf -- ER, you decided that, you believe that, not me. Every battery I've seen here, Yausa, Interstate, Exide, is listed as an AGM on the box, comes dry with a plastic container full of sulfuric acid that you add through the top of the battery, then there is a plastic plate that snaps on over the holes, and this is not really meant to be opened again. These are not true "sealed" batteries, as there is a vent hole in the top of the case. The directions in every one of them say to charge it first before initial use, and you can find that instruction also on their web sites. Every store you go into to buy a battery will fill it first then give it to you, unless you buy it in a box at Walmart, then you have to fill it yourself. I don't know why we're even discussing this, this is the way it is here, over in Europe you may have different batteries.
I have gone through 4 motorcycle batteries (3 from a battery dealer) 'till I found out about the charging business, and have not had any trouble with any of these batteries since. I have also bought small batteries for a jet ski and riding lawnmower, and they are all the same. Buy it, fill it, charge it, then use it.
I have nothing else to add to this.