I installed the utility AccA from F-Droid that @brunoais has already commented on in this thread, it seems to work well. There are settings for limiting charge level, charge rate, high temperature cut off, and low charge level shut down. As already stated, your Pro1(X) needs to be rooted, so this tool may not be for you,
I took instructions from here:
Note: This procedure works on Pro1X, I'm not sure about Pro1 at the moment. I'll amend if I work it out or somebody with a Pro1 can clarify.
I also took the advice of ensuring 'offline charging' was enabled on my Pro1X, (guid