2 Things Challenge: Minus/Plus

The 2 Things Challenge this past week was Minus/Plus.  This is a pile of exhausted minuses and pluses from old alkaline batteries.  Most of them have a little symbol of a garbage can with an "X" through it, which I presume means don't throw them in the garbage, but that may be a European requirement.  So I've been keeping the old ones till I could either find a place to "recycle" them or figure out what I really should be doing with them.  Wal-Mart used to take them, but no more.  As a photographer, even though I use rechargeables as much as possible, I generate a lot of these things and it would be nice to know what I should be doing with them.  Put them in the landfill, or waste gas driving them to Batteries Plus or somewhere that will take them?