Method 1: HyperJuice Auto/Airline Adapter

1) Free adapter that connects HyperJuice battery to the
Apple MagSafe Airline Adapter, to power any MacBook

2) Requires the MagSafe Airline Adapter (sold separately by Apple)

3) Compatible with MagSafe to MagSafe 2 Converter
(sold separately by Apple)

4) Requires NO modifications.

Method 2: HyperJuice Magic Box
(Only 5 mins to modify. Detailed Instructions Provided)

1) Cut your MacBook/MagSafe Adapter's cable.
Don't worry. You will still be able to use your MacBook/MagSafe Power Adapter.

2) Attach Magic Boxes to your cut MagSafe Adapter's cables.

3) Recharge your HyperJuice battery with modified MagSafe Adapter

4) Recharge your MacBook using your HyperJuice battery.

5) Recharge your MacBook with modified MagSafe Adapter

6) Recharge your MacBook with 12V auto power.