I know with some batteries its not good to leave them in the charger after they've reached full charge. Are Canon's batteries safe to leave on the charger once they've hit full charge, or does the charger begin to bleed off the power, thus causing the battery to bite the dust sooner than it otherwise would?

I left one on charge for 4 days last year,it's still working fine!

I've often left batteries on overnight, but it's probably not a good idea to make a habit of it. Too bad they don't have a charger that shuts off after the charge.