I had no idea that these things can be dangerous or rendered useless if left on charge for too long. I guess comparing to my other chargeable electronics, I GROSSLY overcharge and its never been an issue. I think I've only had my laptop OFF the charger a total of 5 times in three years. Man o man.
Learn something new everyday I suppose.
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You might want to take the laptop off the charger more often. You may render the battery useless. It happened to one at a place I used to work. The laptop was always plugged and when they went to use it with only battery power, dead as a door nail. (Who came up with that expression anyway