I have this battery used by the original battery in an Oral-B Professional Care to replace 500 who has time given up the ghost after two years. Held only max. 4 days (two of them then already low cleaning performance) simply and went from time to time in the middle during brushing without warning by flashing red.
After installing the new battery (corresponding instructions can be found on the Internet) keeps the electric toothbrush again seven days through and has to end an acceptable cleaning performance. So I can now hopefully at least. Two years use, because the rest of the equipment is still functioning properly.
