How we estimate our external battery life

Hello,

Recently, we were questioned about our Ultimate Macbook External Macbook battery and did not quite understand what we mean by "2.5 to 6 times" the life of your Macbook.

First of all, you cannot expect the largest Macbook Pro to run 6 times it's internal battery. Because there is a range of MacBooks out there, from the Macbook Air's to the retina Macbook Pro's, we can only give you a range because our battery will support any Macbook model.

So in short, you can expect the Macbook Air to last approx 6 times whereas, the Retina Macbook Pro about 2.5 times.

Now. What do we mean by that? If your rMBP runs about 4 hours on it's own, it'll run for approx. 10 hours total from both internal and external battery when you start off with everything fully charged.  
4 x 2.5 = 10.

Let's not mention the other things too, such as the brightness, how long your hard drive runs, what background processes you are running, how often your Macbook goes to sleep, etc etc. There is not a exact science and everything is different from person to person (or laptop to laptop).

How we test our battery:
1) Fully charge both Macbook and External battery.
2) Wifi on, keyboard light turned on with automatic power on/off, Screen to 80% brightness, no sleep no dim for the duration of test.
3) Have about 10% load on CPU. (typical email processes, and background backup and syncing).
4) Run until laptop is forced to sleep.


Thanks,
Mikegyver.com