I've stopped worrying about mine altogether. Used to try keeping it topped up all the time, but honestly, it didn't seem to make any difference. Now I just plug it in whenever it's nearly dead and leave it overnight. Been doing this for years and still getting a solid week or more per charge. Batteries these days are pretty forgiving anyway... at least compared to the older electric brushes I used to have—they'd barely last a couple days after a year or two of use. Seems like they've improved the tech quite a bit since then.
Yeah, I've noticed the same thing with newer toothbrush batteries. I used to be pretty meticulous about charging mine, thinking I'd prolong battery life by never letting it drop too low—but honestly, it didn't seem to help much. After doing some reading, I learned that most modern toothbrushes now use lithium-ion batteries instead of the older nickel-based ones, and lithium-ion actually prefers partial discharge cycles rather than constantly topping off.
It's interesting because I remember my first electric toothbrush years ago—after a while, it barely lasted two days, just like you said. But my current brush is going strong after almost three years of casual charging habits. Seems manufacturers have definitely stepped up their game with battery tech, which is great news for those of us who don't want to spend extra on replacements every couple of years.
