If you have the old 1990's model then they take two LR44 batteries each
If you have the new Connexion/Connection tamas then they take one CR2032 batteries.
You can buy the CR2032 batteries at: Drug stores, Electronic stores, walmart (if you live in America, i don't) and Toys-R-Us.
You can't really find the 1990's tama batteries anymore!
hope i helped, and have a great tama-talking day!!!