Lol, at the very least could we at least get a link to your post?
Here's a battery question, is it better to leave your phone slow/trickle charging overnight or fast charging in the morning?
NOPE TOO EMBARRASSING.
Battery tech is good enough nowadays that it won't make a noticeable difference either way IMO. When your battery's full it'll trickle charge anyway, and leaving it on the charger overnight is pretty normal.
Hmmm yeah I agree, it depends how "fast" is fast charging as there are a few variants now. It's technically better to just charge overnight and the primary source of wear is cycling for phone batteries. (unlike say laptop batteries where they are plugged in 90% of the time)
For intelligent li-ion battery charging systems, they won't trickle charge overnight, it will stop charging at 100%. The phone won't actually start charging until 95% or sometimes even 90% and this is imperceptible to the user, for all they know the phone still appears to be 100%.
You'll sometimes notice this behaviour on the standby drain, when I go to sleep at 100% battery it still says 100% when I wake up (we know that's impossible), but say when my battery is at 50% before I go to bed, it'll drain to 45% or so when I wake up. A similar thing happens when you unplug your charger at 97% charging, and re-plug it in and it'll appear to shoot to 100% instead of actually topping up to 100% for the sake of battery health.
The reason for this is because they don't want users to keep on topping up their battery to 100% if they only used 5%, being at a high state of charge is quite detrimental for battery health. I need to stop here before I get too much into it.