Originally Posted by nckmat

That's an old trick of lesser quality manufacturers so that if something goes wrong with your batteries they can say "ah you must have left them fully charged for more than two hours". Absolute rubbish, if this was the case then you wouldn't be able to leave a laptop or mobile phone turned off for more than two hours either.

A balance charged battery of decent quality can be left charged for days without any noticeable problem, it's not great for their lifespan, it may shorten it a few dozen cycles but when you can buy a 65C 6600mAh battery for under $50 who cares.