I have this industrial cell size 4 / 5A ordered to with my Oral-B Professional Care 9900 to change the five-year-old built-in battery, according to a popular video instructions on Youtube. But beware: In my toothbrush a battery the size of A was installed, which is so 7mm longer for the same diameter. One can (like me) hinpfuschen by a kind of spacer with built in, but I would strongly advise you to check the actual battery installed previously. Another tip: empty Install the battery in the toothbrush. The toothbrush is believed it would be a flat battery installed, regardless of the applied voltage of the cell. If you build a full battery, the brush will continue to try to get him further charge! (Sic) Before installing I had so charged the cell, while my charger has determined the way a capacity of 1947 mAh, which is so fully in order, which is why I give this product 5 *.
