Just checking in here to say that I also have managed to kill a few Electrons over the months by letting the battery run empty. I tried every suggested fix but couldn’t fix any of them.
By looking at the posts in this thread, the best practice to avoid this is to not allow a brownout to occur. Unfortunately, I use a LiSOCl2-battery setup which doesn’t have the typical discharge curve that a LiPo has, making the voltage level hard to monitor. Essentially, it goes from a steady 3.6V almost straight to a brownout.
I guess I may just have to accept killing a few Electrons every now and then