Included with your adapter is a MagSafe Compatible C28 connector tip for Macbook computers made before mid-2012 and a MagSafe2 compatible connector tip for Macbook computers made after mid-2012
The external battery output voltage should be the same or close to the power adapter output voltage or to the device power jack input voltage, which may be different from the internal battery voltage. It should connect to the computer power input jack where the power adapter usually plugs in.
If your Macbook computer original power adapter is a 18.5V 85W power adapter, this battery may not be able to charge the internal battery and power the computer at same time. You may need to remove the internal battery or use the original power adapter to fully charge the internal battery first when use the external battery.
<4> Turn on the
is a on/off switch on the battery. After turning on the battery, a Red LED light will
Always turn off the battery when not in use. Leaving the battery on may build up static inside the battery cells and damage the battery.
After selecting right tip and determining the
polarity, you can plug the tip into the adapter cord.
If your notebook internal battery is a
working battery and has been fully charged, you can leave it in your notebook.
Otherwise, we recommend you removing the
internal battery from your notebook to maximize the external battery running
The external battery will still work if you leave a non-charged
internal battery in the notebook, but it may not reach the maximum running time
since it needs to charge the internal battery at same time when it is powering
How long can this external battery run
This battery's capacity is around 100Wh(Watt-hour):
you can compare
this battery's capacity with your internal battery capacity to figure out how
long this battery can run your notebook. For example, if your notebook internal
battery output is: 10.8V & 4000 mAh, then, your notebook internal battery
10.8V x 4000 mAh = 43200 mVAh= 43.2 Wh (Watt-hour).
This external battery capacity is about 100/43.2=2 times of your
internal battery capacity.
If your internal notebook battery can run 5
hours, then the external battery pack can theoretically run about : 5 hours x 2
= 10 hours.
This is a rough estimate.
Actual running time varies, depending on notebook computer's configurations and
what kind of applications are running . For example, screen brightness, the use of
the CPU, the hard drive, the CD drive, and other peripherals results in an
additional drain upon the battery, effectively reducing the battery's run-time.
The total run-time of the battery is also heavily dependent upon the design of
the notebook. To ensure maximum performance of the battery, optimize the
computer's power management features. Refer to the computer manual for further