After my electric toothbrush was extremely noisy - we thought at first that it would be the battery .... after we had bought this / received, the toothbrush was the same as before - no difference; I was disappointed! When I talked with the seller, he offered me a free replacement of the engine, because he suspected a defect of this - at no extra cost to the previously obtained battery. As this a few days later and my husband was exchanging these, my brush ran perfectly again. I then sent the battery back to the seller. I highly recommend this shop, very responsive and knowledgeable; next time I will buy again for sure .... here!
