Charges and recharges AA, AAA, C and D REchargeable batteries. HOWEVER, have to charge more often and not as powerful as regular C/D batteries. I got this to recharge C batteries for my Cat's Meow cat toy. It does not make the stick go around as fast as regular C batteries. I cannot afford to buy 3 C batteries every WEEK, so I got this one. Disappointed in charger/batteries as not being powerful enough.