Can you overcharge the battery?

I know you can kill a cell phone battery by overcharging it. I know the iPod has a lithium-ion battery. Is that the kind you can charge at will (like my home cordless phone) as much as you want, or the kind like my cell phone that should deplete before recharging fully but no longer than that?
TIA

I know you can kill a cell phone battery by overcharging it.
No you can't.
kind like my cell phone that should deplete before recharging fully but no longer than that?
Don't know what kind of cell phone you have but I've never seen on like this.
NiCads should be charged fully before first use. They are prone to memory effects.
LIon batteries are not. Use them and charge them when you wnat.

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