Fits and works, but not as good as original battery
Update -- 2 years later: After about a year the battery started to hold notably less lifetime than it had originally (brushing stopped after less than 2 minutes), and this time has gone down further. This decrease was far steeper than for the original battery.<br /><br /> Not sure whether that made the repair worth it, given the cost of a new brush.<br /><br />Old review:<br /><br />Contacts fit perfectly when replacing old battery in a 6200 series toothbrush. Once I figured out how to open (pry the base off carefully, in my model it is connected to the innards with tiny wires which I accidentally tore and had to solder together again) if was a very easy repair (if you are not scared of easy soldering)
Rating: 4 stars