NiCad vs Lithium batteries

I was all set to buy an Oral-B 5000 tooth brush until a review pointed out that they have Ni-Cad batteries not Lithium.
I pretty much do not buy Ni-Cads anymore, you have to keep them on a charger 24 hours a day even when you don't use them. So that ended the sale promptly.
Please add battery type to your analysis.

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