Li ion batteries work opposite to NickelCD.
I'd recommend to always keep them charged.
Like laptops, whenever in reach of a wall socket it is better to keep them plugged in.
The less you use them,the less they can wear out.
After 2 to 3 years of using my laptop, with plugging in always when possible, my battery (large capacity) still holds 3 of the 4 hours of batterylife!
Wouldn't have been possible with my wife's laptop which only gets plugged in when empty.
Besides, generally when a Lithium battery still has 80%left, they get slowcharged, which is more healthy for the battery.
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