Battery life drain on power supply

-BigMac-

macrumors 68000
Original poster
Apr 15, 2011
1,553
1,203
Melbourne, Australia
Hi Guys.

I am curious if/how bad is having your macbook pro plugged into the power source after it has reached 100% charge. Is there an effect on the battery life 'maximum charge' when constantly left plugged in for a few hours, overnight or even for a couple of days.

I have always thought this must have some negative effects on the battery.
Anyone shed some light on this please?

Thanks a lot :D
 

Gav2k

macrumors G3
Jul 24, 2009
9,218
1,585
As long as you use your battery (1 cycle) per month it'll be fine. If your storing it for long periods it's better to be at 50-70% before powering down and storing.

Other than that use it as you please. You won't overcharge the battery leaving it plugged in
 

snaky69

macrumors 603
Mar 14, 2008
5,903
480
Hi Guys.

I am curious if/how bad is having your macbook pro plugged into the power source after it has reached 100% charge. Is there an effect on the battery life 'maximum charge' when constantly left plugged in for a few hours, overnight or even for a couple of days.

I have always thought this must have some negative effects on the battery.
Anyone shed some light on this please?

Thanks a lot :D
No, we aren't in the 90's anymore. Battery myths such as this one need to die a quick and painless death.

Let's clear a few things up:

Today's batteries do not have a memory effet.
Today's batteries do not need to be constantly cycled to stay effective.
Today's batteries cannot overcharge.
Today's batteries all have a micro-controller ensuring proper charge rate, and that controller even trickle charges and discharges the battery to keep the electrons flowing when plugged in for long periods (we're talking months here).

To keep it short and simple: Use your battery however you please, nothing you do will make it have a longer lifetime, it'll die on its own, regardless of your usage in 3-5 years.
 

-BigMac-

macrumors 68000
Original poster
Apr 15, 2011
1,553
1,203
Melbourne, Australia
No, we aren't in the 90's anymore. Battery myths such as this one need to die a quick and painless death.

Let's clear a few things up:

Today's batteries do not have a memory effet.
Today's batteries do not need to be constantly cycled to stay effective.
Today's batteries cannot overcharge.
Today's batteries all have a micro-controller ensuring proper charge rate, and that controller even trickle charges and discharges the battery to keep the electrons flowing when plugged in for long periods (we're talking months here).

To keep it short and simple: Use your battery however you please, nothing you do will make it have a longer lifetime, it'll die on its own, regardless of your usage in 3-5 years.
thanks heaps :) taht puts my mind at ease :)