These NiCad batteries had metal tabs that are connected with a charging base. From then on, improvements on the size of handle, portability, and design were made. Currently, electric toothbrushes are portable and all parts are completely covered in plastic; no metal parts are exposed.
The whole unit is hermetically sealed. This design is meant to prevent water from entering the unit and causing damage. It also minimizes electrocution to the user. Modern designs use inductive charging.
Inductive charging, or wireless charging, uses an electromagnetic field in transmission of energy between two objects. Depending on which model you have, it should take between 14 and 22 hours to fully charge the brush, and then the juice should last for between 5 and 12 days of brushes when brushing twice a day, for 2 minutes each time. First thing to do is check that the power outlet you are using is working as it should.
Make sure you are not charging the toothbrush on a metal surface. The metal can interfere with the charging process. The best thing to do is to put it on the charger for 30 minutes or so, and then try to switch it on. For all other toothbrushes, they should be charged for 22 hours. It also avoids any problems with water getting into the contacts and shorting out the charger.
This sort of sealed arrangement is called inductive charging. Essentially, the toothbrush and the base form a two-part transformer, with the base having one part of the transformer and the toothbrush having the other. When you slide the toothbrush onto the base, the complete transformer is created and charge can flow.
The base contains one of the coils and the metal bar. The toothbrush contains the second coil. When you drop the toothbrush onto the base, you create the complete transformer! Sign up for our Newsletter!
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