Mavericks 10.9.2. drains my 2013 MBA's battery incredibly fast while sleeping.

Have you had it on power all the time AND in sleep mode?

Thats bad on the battery

Sleep mode is one thing and fine, sleep AND power is another thing.

"Apple does not recommend leaving your portable plugged in all the time."

General consideration of your MacBook battery

Contrary to popular myths about notebook batteries, there is protection circuitry in your Macbook and therefore you cannot ‘overcharge’ your notebook when plugged in and already fully charged.

However if you do not plan on using your notebook for several hours, turn it off (plugged in or otherwise), since you do not want your Macbook ‘both always plugged in and in sleep mode’.

A lot of battery experts call the use of Lithium-Ion cells the "80% Rule", meaning use 80% of the full charge or so, then recharge them for longer overall life. The only quantified damage done in the use of Lithium Ion batteries are instances where the internal notebook battery is “often drained very low”, this is bad general use of your notebook battery.

A person who has, for example, 300 charge cycles on their battery and is recharging at say 40% remaining of a 100% charge has a better battery condition state than, say, another person who has 300 charge cycles on their battery and is recharging at say 10-15% remaining on a 100% charge. DoD (depth of discharge) is much more important on the wear and tear on your Macbook’s battery than the count of charge cycles. There is no set “mile” or wear from a charge cycle in specific. Frequent high depth of discharge rates (draining the battery very low) on a Lithium battery will hasten the lowering of maximum battery capacity.

All batteries in any device are a consumable meant to be replaced eventually after much time, even under perfect use conditions.

➕If the massive amount of data that exists on lithium batteries were to be condensed into a simplex, helpful, and memorable bit of information it would be:

1. While realistically a bit impractical during normal everyday use, a lithium battery's longevity and its chemistry's health is most happy swinging back and forth between 20% and 85% charge roughly.

2. Do not purposefully drain your battery very low (10% and less), and do not keep them charged often or always high (100%).

3. Lithium batteries do not like the following:

A: Deep discharges, as meaning roughly 10% or less on a frequent basis.

B: Rapid discharges as referring to energy intensive gaming on battery on a frequent basis (in which case while gaming, if possible, do same on power rather than battery). This is a minor consideration.

C: Constant inflation, as meaning always or most often on charge, and certainly not both in sleep mode and on charge always or often.

From Apple on batteries:

http://www.apple.com/batteries/notebooks.html

http://support.apple.com/kb/HT1446

"Apple does not recommend leaving your portable plugged in all the time."

I'm also facing exactly the same issue after updating to OSX 10.9.2 Infact I've noticed the decline in battery backup when I use my MacBook Air (2013) along with the decrease in battery backup while computer is sleeping. Hope Apple is aware of the issue and resolve this asap.

I can firm this exact same problem on my mid 2013 MBA after 10.9.2. Used to snap it shut and come back later without drain. Now it runs warm and depleats the battery but only SOME of the times. Been very hard to isolate. I have an open ticket thst has reached the senior engineers. We'll see. BTW, the situation gets worse... if you let it sit long enough (about 12 hours in my case) it totally runs out the battery and hard-stops, losing everything that was open and running to 0%.

Same issue here with Macbook Pro Retina. Battery stuck at 2% and when plugged in says "battery not charging"

10.9.2 messed some serious stuff up. First safari was sticking when scrolling back via mouse pad, now my battery won't charge....I can't get it to go past 2% so I'm stuck plugged in for now!!!

Reset SMC after your OSX update, unless your charger is broken (a defective capacitor on the charger block board) , then your Lithium cell WILL charge.

however HOW well it charges (i.e. chemistry) is unknown due to unknown factors in how you have treated said battery.

I had this problem, and tried a few things without success. What did work was turning the keyboard light off -- System Preferences/Keyboard/"Turn off when computer is not used for..." was set to "Never". I set it to "5 secs" and now I'm back to great battery life.

So I figure the bug is that the light doesn't turn off in Sleep.

I have been suffering the same issue, in the evening I left battery near to 100% and when i come in the morning is about 30-40%.

jdayllon wrote:

I have been suffering the same issue, in the evening I left battery near to 100% and when i come in the morning is about 30-40%.

Run Etre and post results on what is draining the battery

use this FREE little test APP to verify (most people here use it for diagnostics)

http://www.etresoft.com/etrecheck

EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. EtreCheck automatically removes any personally identifiable information from the output.

I have the same issue here as well. Since 10.9.2 update of my Mid 2013 Macbook Air, my battery drains to 0% when in sleep mode and unplugged. I hope a fix is released soon.

biznice wrote:

Macbook Air, my battery drains to 0% when in sleep mode and unplugged.

As a side note, NEVER let your Air drain (or even close) totally. Its ruinous on the battery.

In a very harsh way people often fail to know or recognize.

😊