Build a coin charger for a buck

The article says for a dollar.  I’m thinking its around $3 myself just looking at stuff on ebay.  But still its a good idea.  I usually buy 50 of these batteries for $10, and toss them when spent, but it would be nice to re-use them.

http://hackaday.com/2014/01/17/1-coin-cell-charger/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+hackaday%2FLgoM+%28Hack+a+Day%29