General Charge phone throughout day or let drain

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http://androidforums.com – I know traditionally you were supposed ti have let phone batteries for out and then charge them to 100% in order to avoid damaging tge battery life. But as i understand it, lithium ion batteries are different. I read that letting these phones loose all charge damages the battery. So my question is, should i charge randomly throughout the day in my car, by a computer, ect. Or should i just let out die? (General)