Hibernate Option for Mac

We all know that one of the reason for people to purchase the super expensive Macbook is the battery life.
LaptopMag.com which is one the Tom's Hardware affiliates, one reliable source, at least for me, says that Mac product both Air and Pro is within the list. Check out the full article here, http://www.laptopmag.com/articles/all-day-strong-longest-lasting-notebooks.

Now, with me here is Macbook Pro, mid 2012 model which battery has just been replaced, so it ought to work like new. It surprises me that when I leave it to sleep mode, I turn it back on, it was reduced by about 25%. When I put it on sleep, I believe it's about 88% and when I turn it back on, it has became 65%.

So, I'm off to find out how to reduce the battery power during sleep mode.

My first source was Apple Stack Exchange. For your reference, stackexchange.com has been my wonderful reference. It has vast collection like I never imagine.

From this site, I knew that the Energy Saver Preferences can also be set by using Terminal command, pmset. From the manpage of pmset, there are 3 types of sleepmode:

Energy Saver

• Type 0. This is used by default on iMac series. The system will use memory and not write to the disk.
• Type 3. This is used by default on Macbook. In this type, it will use RAM as the storage.
• Type 25. In this type, the memory will be written to the disk.

You can read more from the manpage of pmset, just type man pmset in Terminal to access this. From the explanation, I want to have type 25. So what I do is, open Terminal and then type the following:

$sudo pmset hibernatemode 25
and hit enter.

Now, your Macbook should have been set as hibernate. It means, everytime you go to Sleep mode, you go into Hibernate. I have proven myself, after I turn this on, I leave the Macbook to sleep for about 18 hours, my battery was reduced by 3% into 62%.