Note or precaution: Place a piece of cardboard over the speaker or use a plastic/rubber/nonmetalic handled screwdriver when loosening/removing the 13 mm screws. The speaker magnets are so powerful that the end of my metal jewelers phillips screwdriver was pulled into the speaker, tearing the plastic/rubber cone. I destroyed two speakers in the process of replacing the battery. Had to buy the speakers from JBL ($16 each).