How to calibrate Mac battery

Depending on if your Mac portable has a third-party replacement battery

such as 'newertech nu-power' or other similar battery pack, it may still be

necessary to cycle the battery per their instructions.

Awhile back I bought a newertech nu-power replacement battery for my

older portable Mac notebook and the seller suggested I review their site

and follow instructions to calibrate and test the battery prior to initial use

as well as do the same steps later... And Prior to obtaining warranty claims

the maker required buyer to re-test a battery again with same instructions.

..conditioning= calibration/re-calibration..?

newertech-newerbatteryconditioning_instructions

So while some users may never have replaced their battery with third-party

quality replacement from reputable maker IF they still could get original OEM

part from Apple store; for those others, the calibration instructions may help.

For general Mac notebook batteries, this covers most support topics & links:

• About Mac notebook batteries - Apple Support

• Apple Portables: Troubleshooting MagSafe adapters - Apple Support

• Using and maintaining your Apple MagSafe Adapter - Apple Support

{Later models do not use MagSafe power adapters; USB-C/Thunderbolt3.1 adapter

port has different specifications & connectivity issues to ponder via support site info.}

Good luck & happy trails! 🙂

The old way was to make sure it was at 100% (you might even need to let it drop to below 95% before it starts to charge up again) and then use it continuously on battery power until it goes to "save to disk". The screen will turn gray and there should be a message about it saving the environment to disk before it shuts itself down at 0% capacity displayed. Then it can be recharged and should spring back to life rather quickly. The screen will come up gray looking like what was going on while it previously shut down, and then will recover back to the environment you were previously using.

Calibrating your computer's battery for best performance - http://support.apple.com/kb/ht1490 now directs to: Batteries - Maximizing Performance - Apple