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I dont see why. These batteries are pretty smart these days. They wont overcharge. However, Ive always simply used my devices unpluged and let them run down a bit then recharge. Never let it get down to zero charge but hitting 15% - 20% is just fine and helps the status indicator stay accurate.
 
Short answer is no. In fact, practically nothing that you're likely to do to the battery will harm it. Charging or discharging at any percentage is fine. Overcharging is not possible, and it doesn't need to be charged back to 100% each time. All of those things were issues with old Ni-Cad batteries. Lithium ion batteries don't have such flaws.
 
No, absolutely not. To have to juggle something like that would be beyond annoying. Just keep it plugged in 24/7 if you want.
 
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