I’m mostly playing BG3 those days and the battery lasts max 1,5-2 hours until I have to plug it again. So if I have a long playing session (like today, slow Sunday) I will have to charge it pretty frequently. Is it bad for the battery? I wish it lasted longer, but oh well (don’t see myself upgrading to oled at this time).
A depleted battery usually acts as a second load on the circuit but it can also be a second power source if the three are in parallel with one another (as opposed to being isolated and switched). In the case of an inadequate power supply, a high current draw will pull from both sources at once. This is not necessarily common or desirable but you do see it in things like a vehicle alternator+battery, for instance.