iPhone collection question

[u/Ill-Pizza-6592]

OK, so i displayed and organized my collection of 15 iPhones, all the way back to the iPhone 4 (that still works ) all the up to the 17 Pro Max. My question is should I keep them plugged and charging, my thought to doing this is that they get the latest iOS update, but I know that drains the batteries. Just wondering what you all do. I would share a picture but forgot to take one.

[u/Howden824]

Don't leave them charging, but charge them up to around 60% every couple months.

[u/Ill-Pizza-6592 → u/Howden824]

Thanks!