MacBook Pro self-discharges while sleeping

[Cubytus]

Hello here,

I noticed that, unlike earlier when I started to use this Mac, if I leave it sleeping in my bag during half of the day only to wake it up later, the battery only holds a charge of anywhere between 75 and 90%.

Of course, the Console doesn't record anything between the time I put it to sleep and the time it is woken up.

How to correct this bug and revert to the standard behavior, i.e. sleeping soundly until needed, without losing more than 1% every 48 hour?

 

[GGJstudios]

Hello here,

I noticed that, unlike earlier when I started to use this Mac, if I leave it sleeping in my bag during half of the day only to wake it up later, the battery only holds a charge of anywhere between 75 and 90%.

Of course, the Console doesn't record anything between the time I put it to sleep and the time it is woken up.

How to correct this bug and revert to the standard behavior, i.e. sleeping soundly until needed, without losing more than 1% every 48 hour?

It is normal for your MacBook Pro to consume about 1% battery capacity for every hour of sleep. If it's consuming more than that, it's possible your MBP isn't staying in sleep mode the whole time.

For sleep issues, you may find some useful ideas here:

• Mountain Lion: About Power Nap
• Determine why your Mac wakes up from sleep
• OS X Mountain Lion: If your Mac won’t go to or stay in sleep
• Mac OS X: Why your Mac might not sleep or stay in sleep mode
• One sleep problem caused by printers - solved ... and another
• If your Mac isn't sleeping properly and you have gfxCardStatus installed, try uninstalling it.

 

[Cubytus]

Well, this isn't Mountain Lion, but Snow Leopard. So Power Nap wouldn't apply here. There is no gfxCardstatus as there is no dedicated GPU in the 13". I should have stated that in the first post.

It is hard to tell if the Mac is actually waking from sleep, or just discharging, because nothing is recorded in the Console, unlike when I experimented random wake-ups with my very first MacBook when it was hauled on a bike.

I will have a look into the printers as I am indeed using shared printers.