Oral-B Smart Series 4000 Cross Action Electic Toothbrush @ Asda £60
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Oral-B Smart Series 4000 Cross Action Electic Toothbrush @ Asda £60

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5 Comments

Cold.The 6500 is only £59.99 on Amazon. The 4000 can usually be had for under £40 but the 4000N is currently £51.99 on Amazon.
Edited by: "rhinopaul" 14th Oct

Only £54.99 at Amazon.co.uk

rhinopaul1 h, 57 m ago

Cold.The 6500 is only £59.99 on Amazon. The 4000 can usually be had for …Cold.The 6500 is only £59.99 on Amazon. The 4000 can usually be had for under £40 but the 4000N is currently £51.99 on Amazon.

Isn't 6500 an older model with NiMH battery and 4000N Li-ion? So comparatively 4000N would be better even if same price

Still Amazon price better

akramfaisal14th Oct

Isn't 6500 an older model with NiMH battery and 4000N Li-ion? So …Isn't 6500 an older model with NiMH battery and 4000N Li-ion? So comparatively 4000N would be better even if same priceStill Amazon price better


I cant find any specific information regarding this. The question has been asked on Amazon and replied by the manufacturer that it is NiMH but even if it were Li-ion there wouldnt be much noticeable difference if any in a device like this.

rhinopaul56 m ago

I cant find any specific information regarding this. The question has been …I cant find any specific information regarding this. The question has been asked on Amazon and replied by the manufacturer that it is NiMH but even if it were Li-ion there wouldnt be much noticeable difference if any in a device like this.


Not in the first few weeks or even months. After a year or so, my brush only had proper brushing power only the first day. NiMH is not so good with retaining energy and constant voltage. If you think about it, the degradation starts after a few weeks. Normally people don't notice since it's a gradual decrease.

Li-ion doesn't have this issues (it's very small).
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