We are a K-12 school with ~120 surface go 2 & 3 used as shared laptops. Recently we are having trouble with smart charging in exam situations. Picture this true use case. You have laptops with some battery wear 10-15% each because they are a year or two old. You have smart charging saying they can only charge to 80%. You have a long online exam. Now as you can imagine, the batteries almost ran out during the exam on the ones that were used. We really want a way to manage smart charging using intune so we can turn it off on all our laptops for the exam period (about two weeks). Currently, there is only one manual button in the surface app that you can change that will turn it off for a few days. No one wants to do this on 120 laptops a few times during the two week exam period. How can we turn off smart charging using powershell or intune? I have looked everywhere for a solution but have not found one a workable one (someone suggested to drain the battery to < 20% before the exam period). We would like a bit more of a reliable solution.  

Also, talking about battery, how can you put a battery percentage on the screen before the login screen (or even the login screen). We tried to remove laptops with low battery (between 50-70%) before the exam but that battery icon before the login screen made it so difficult to tell anything that we had to login just to check the battery percentage. We know there is some battery icon changes recently but I could not find any information about if it changes the login screen or the screen before the login screen.

Thanks. (P.S I am in +8 GMT so wont be able to attend online)