PDA

View Full Version : Battery problems with Minidrive or other permanent SD card




ZBoater
Aug 11, 2013, 08:48 PM
Anyone with the Minidrive or other full time SD card solution having battery problems? Like the battery draining overnight even though you closed the lid?



robvas
Aug 11, 2013, 09:57 PM
Anyone with the Minidrive or other full time SD card solution having battery problems? Like the battery draining overnight even though you closed the lid?

Are you?

ZBoater
Aug 11, 2013, 10:17 PM
Are you?

Not sure. My MBA lost 6% overnight which I thought was steep. I ejected the SD card (but left it installed) and closed the lid last night at 82%. Today when I opened it, it was completely drained (would not turn on). I need to do some more testing before I know for sure.

larry918
Aug 11, 2013, 11:32 PM
Not sure. My MBA lost 6% overnight which I thought was steep. I ejected the SD card (but left it installed) and closed the lid last night at 82%. Today when I opened it, it was completely drained (would not turn on). I need to do some more testing before I know for sure.

6%? That's quite normal. I don't have link with me right now, but there's a guide for Apple Batteries that states that loosing 1% every hour during sleep mode is regular behaviour.

ZBoater
Aug 12, 2013, 03:17 PM
6%? That's quite normal. I don't have link with me right now, but there's a guide for Apple Batteries that states that loosing 1% every hour during sleep mode is regular behaviour.

Ummmmm, no.

"Put MacBook Air to sleep for more than 3 hours, and it enters standby mode to conserve battery life for up to 30 days." (from the Apple website).

30x24 = 720. So unless I get 720% battery, there is something wrong with either the math or my MBA.

Phonzel
Aug 12, 2013, 04:25 PM
... there is something wrong with either the math or my MBA.

It's the i7 :D

ZBoater
Aug 12, 2013, 04:32 PM
It's the i7 :D

Bwhahahaha. I love it. :D

I may have done this to myself. I disabled hibernation so that 8GB sleepimage file doesn't get created. That's probably needed for the 30 day sleep (doh!). So is 6% overnight decent? I wonder why ejecting the SD card but leaving it in the slot made it loose 82% overnight? I need to test that again.

Weaselboy
Aug 13, 2013, 11:39 AM
Bwhahahaha. I love it. :D

I may have done this to myself. I disabled hibernation so that 8GB sleepimage file doesn't get created. That's probably needed for the 30 day sleep (doh!). So is 6% overnight decent? I wonder why ejecting the SD card but leaving it in the slot made it loose 82% overnight? I need to test that again.

Check this out (https://support.apple.com/kb/HT4392). If you have a SD card inserted it will prevent standby mode (deep sleep) and battery life will suffer.

ZBoater
Aug 13, 2013, 11:49 AM
Check this out (https://support.apple.com/kb/HT4392). If you have a SD card inserted it will prevent standby mode (deep sleep) and battery life will suffer.

Thanks for sharing that. I had seen it, which is why I tried ejecting the card but not removing it. I tried it again last night, ejecting the card but leaving it inserted, and I lost 90% battery over an 8 hour period. I will try again tonight leaving the card inserted and active to see how much battery I will loose.

ZBoater
Aug 14, 2013, 07:00 AM
Okay, last night I lost 2% over 9 hours. Now that I recall, my previous 6% loss was over 24 hours. So having the card inserted and active doesnt seem to be causing a big drain, although there is no way I am getting 30 days out of this which I guess is due to not being able to go into deep sleep. And ejecting it in the system but leaving it inserted in the slot is bad ju ju.

I guess the price of having the card all the time is to actually turn off the laptop overnight...

Stetrain
Aug 14, 2013, 07:06 AM
Ummmmm, no.

"Put MacBook Air to sleep for more than 3 hours, and it enters standby mode to conserve battery life for up to 30 days." (from the Apple website).

30x24 = 720. So unless I get 720% battery, there is something wrong with either the math or my MBA.

The majority of that drain could be happening during the 3 hours before it enters standby mode.