If you are talking about one of these or similar
http://www2.towerhobbies.com/cgi-bin...&I=LXJGS6&P=ML
you can see that a charger comes with many of them. If you have lost your charger, you can buy one separately
http://www2.towerhobbies.com/cgi-bin...?&I=LXD701&P=7
Some power panels also have a place to charge ignitors
http://www2.towerhobbies.com/cgi-bin...&I=LXACW7&P=ML
as seen in the lower left corner of the above panel.