Well, the reason we don't recommend them is the risk that one day you'll put one in a charger by mistake, and when that happens, they can explode the first time you fire up the atty - and they do go with a lovely big bang right in your face.
If I were you I'd forget about any 'protected' sticker on them and treat them as a potential small stick of dynamite - because that's exactly what they are.
No doubt they'll be thrown away fairly soon and that's good. Get AW IMR Li-Mn rechargeable cells, sure they cost more, but you are going to charge these things and put them right in front of your face, so think about it...