The first 2 points kind of contradict each other, do you mind elaborating? Wouldn't charging it to max make it too hot?
They don't contradict.
For day to day use, I charge them to the maximum.
For long term storage (ie. not using it for months) then I'd charge it to around half.
Temperature can be controlled, so keep your devices cool while charging. Put them next to a fan or an Air Conditioning vent if you need to.
By the way, is it possible for ac adapters to get damaged themselves?
Over time, every adaptor can get damaged wires. Strains, stresses and kinks in the wiring can cause the internal wires to break over time.
But what if I'm storing it along with the system?
Do you have to store it with the system? I'll take the battery out when possible, but if not then I'd store it in the basement, cool dark place in a resealable plastic bag. Throw in those Silica Gel packets if you have them. I'd check on it once a month or so.
But the damage done to the ac adapter has nothing to do with charging correct?
Yes, I'm actually talking about my Nintendo consoles since they can't be removed (unless I unscrew them). And in fact, Nintendo tells to recharge it every 6 months. But I don't know if to believe them. And you said you'd "check on it every month or so", but how would you do that?
Also, battery university says that li-ion batteries don't need max charge and in fact, work best and last longest at 20%-80%. I still charge it to max out of habit, but just saying.