MBP Retina 13inch: battery best practice?

[snaky69]

But I have heard that you don't leave your Laptop Battery Plugged in if it is already showing charged 100% because by even overcharging the Life of the Battery reduces !! is there any truth in this theory ?

The computer draws power from the adapter when it needs to. The adapter does not push power in.

When the battery reaches 100%, no electricty whatsoever is going into the battery. The controller prevents that. You litterally cannot overcharge it unless your charging circuit is faulty.

 

[T5BRICK]

Just use it as any other battery - don't leave it charging for long periods of time, let the battery die completely every once in a while so it can re calibrate the estimated time remaining.

This isn't true. Macs with non-removable batteries do not need to be calibrated.

Running the battery down completely is actually one of the worst things you can do. At one point, Apple suggested completing one charge cycle per month, but they did not suggest completely draining the battery. A charge cycle is counted as any time that a battery is discharged a total of 100%. Here is how Apple counts charge cycles.

But I have heard that you don't leave your Laptop Battery Plugged in if it is already showing charged 100% because by even overcharging the Life of the Battery reduces !! is there any truth in this theory ?

Just plug your Mac in when you can. Run it off of battery power when you want/need to. Other than that just don't worry about it. It'll last 3-5 years no matter what you do. There is a lot of misinformation out there and it sounds like you've read some of it. Just enjoy your computer and forget about the battery.