120 versus 240 charging versus battery life

[JimP1]

I have a 2016 Model S that I have charged mostly at 120 V. I'm approaching 90,000 miles with little or no loss in battery capacity. I'm wondering if charging slower helped. For example would the slower flow of electrons result in less side reactions the degrade the battery?

 

[jjrandorin]

All home charging is slow charging, to the car. There isnt any difference in relation to battery degradation in charging at 120 vs charging at 240v home charging speeds. There would be a difference in supercharging vs home charging.

All charging at 120v has done was keep your car awake while its charging for a longer period of time, thus costing you more money in energy costs than you might have paid otherwise. Whether that difference in cost would cover whatever the cost to install 240v charging where you are, is another matter.