Optimal charge time for SBH50 (on AC and on computer USB port)

What is the (see subject title)?
On the manual, it says 2.5 hours initial charge.
Is there a possibility of "overcharging" the battery on the SBH50 if I leave it on the AC overnight?
Is it better to drain the battery thank always having to recharge it when the bar is midway?
Any help would be great, thanks!

You can not overcharge your device, don't let the battery go bellow 10%, it wont damage your device if it does but its better to have some battery left
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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Optimal charge time for SBH50 (on AC and on computer USB port)

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