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Video about changing the battery in an OralB Triumph toothbrush. The battery was lasting less and less, I bought a Ni-Mh 4/5A 1.2V and 2,200 mA for about €4, the assembly is very easy, it took me less than 30 minutes to record the video and everything. The change is spectacular, the battery lasts longer and you can notice much more strength when brushing.