When it's at 100% let it drain until it prompts you to plug the A/C adapter in. If you frequently charge it when the capacity is at say for example 60% then you'll find that the health will start to wear down. My Macbook now only fully charges to 98% for that exact reason.![]()
Do the battery have expire date?
So even if i take out the battery and use the A/C adapter all the time. Does the battery will still wear down?
the laptop will run of the mains power when it is at 100% charge. it will not be charging and discharging the battery. also i wouldent do that as the plug could get nocked out and this would do more damige than it will prevent.
Also MacBooks will run slower if they are used only with their MagSafe power connectors and without their batteries.