Do you charge your cell phone to 75%? it is the exact same thing. If you really wanted to preserve the battery inside your cell phone, you would only charge the device to 75% and not let it drop below 35% charge and would charge it in small incriments during the day, but reality is that nobody does that and yet our cell phones seem to still work and don't break from battery failure after doing everything wrong with them for even 2-3 years. And your sell phone has a much smaller battery that will make it subject to far worse impact from overcharge/extreem discharge and overheating while being charged.
I have an Ipad that is getting on to 5 years old and it still holds a full days charge and shows the battery life wear at only 85%.
2018 Niro EX - Ocean Blue
GTA - Canada.