The TBCharge range is designed to work with Oral-B/Braun toothbrush models which is around 74% of the UK electric toothbrush market. The base with the pin does mean that certain models will not work with the TBCharge.
Oral-B iO (Magnetic base)
Oral-B iO toothbrush models with the magnetic charging base is not compatible with the TBCharge.
Phillips (Sonicare)
The Phillips Sonicare electric toothbrush uses a different design charging base which does not fit on the base of the TBCharge.