I'm not sure about the dangers of such actions, but this commit has good description of how charging behaves once it's done: https://git.merproject.org/mer-core/...853bd74785bcec
I guess charging stops once bme detects that voltage didn't increase after certain amount of charging time and that is considered as the new "full capacity". Restarting bme causes this to go into charging/detecting cycle at least once more.