Just changed the non changeable battery of my Oral B Professional 3000. Feel like the god of repairing thingies now. Needs basic soldering skills and a steady hand. Also, the battery must have contacts for soldering. I used this instructions ( http://reparaturblog.blogspot.de/2013/01/akku-wechseln-bei-einer-braun-oral-b.html?m=1 ). Everything you need to know is in there.

















