Li-ion batteries for power tools are just like those for hearing aids and smartphones and EVs. They do best if kept in a 20% to 80% SOC range. I usually have several for each tool and as I use them, I check the number of LEDs lit and swap them out to stay within a desirable state of charge.
My EGO power tools have quite large batteries that are equipped with vents and the charger has a fan built in so as I charge the batteries, they are air-cooled (also while in use on the tool, too). My DJI drone, which really maxes out battery drainage and battery heating while in use, instructs me to wait 30 minutes after use to allow a battery to cool before recharging! The DJI batteries have no vents and they get pretty warm while in use.
I imagine HA batteries are so small that the surface-to-volume ratio is so great that any worries about overheating the batteries during charging or use at normal room temperature are virtually nil as compared to the larger batteries used in power tools and drones. But it would be great to see the sort of smarts that are available in iOS and Android apps to tell you about the state of health of your battery come to HA’s to give you more info on how your rechargeable HA batteries are holding up. iOS has the “Battery Health” indicator, which at least helps inform you as you’re going along ~how much usable lifetime you have left. Most of my other Li-ion battery powered devices, including my HA’s, offer no info on how the battery is holding up and the user has to guess by how fast the battery drains.