As in modern lives we are using more and more portable electronic devices, the battery we choose matters a lot to the performance we eventual get, especially for electric toothbrushes.
Now let’s take a look at some of the most commonly used types of batteries.
Voltage drop quickly as remaining capacity runs low
Good current output
Good current output
High energy density
High discharge rate
We can see that due to its low-price and low-discharge rate, alkaline batteries are perfectly suitable for a remote controller or any other low consumption devices.
While for power-hungry devices, such as a electric toothbrush, NI-MH batteries and Li-ion batteries are almost competing toe to toe. But since NI-MH batteries suffer from a obvious memory-effect, it needs to be fully charged and fully discharged every time, otherwise its capacity drops severely. This is the reason why some of the new electric toothbrush could last for up to 28 days at the beginning but as it cannot be fully discharged every time and as time went by, last less and less days. Meanwhile Li-ion batteries don’t suffer from this memory-effect. Actually, high quality Li-ion batteries could withstand 300 circles of charging and discharge, and still maintain at least 80% of it original capacity.
There is no absolute answer that which battery is a all-time winner, it really depends on the actual circumstances.
But for a high power consumption device such as a electric toothbrush, a large capacity Li-ion battery is after all the best choice, as its voltage out-put is stable from full to near empty, that always delivers a good brushing experience, and last long enough( for example, 90 days)on a single charge, and the capacity almost doesn’t deteriorate over charge and discharge.
Most importantly, when a electric toothbrush last long and produces no waste batteries in a foreseeable period, we are actually reducing pollution and make for a better environment.