Dispose of ethically. NiMH batteries can be charged or "topped-off� at any time without affecting battery life. In order to achieve optimum performance from NiCd batteries, they must be fully discharged before recharging. Unlike NiCd batteries, NiMH has No Memory Effect. NiMH batteries have no Cadmium added. Cadmium is hazardous to the environment. Sony CCD-F33 Camcorder Universal Replacement Battery BNH-159-4 One Year Warranty Dimensions: Length: 3.55" Width: 1.82" Height: 1.63" Fits and Replaces: Pentax MB-02 Sony CCD-F33 Sony NP66 UPC : 009322-159403