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Old Jun 12, 2012, 05:41 PM   #1
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Join Date: Aug 2010
I made an external battery for my Air

I needed more portable battery power and did not want to spend $200+ for a hyperjuce so I made my own external battery pack for my Macbook Air. It’s 65w LifePO4 battery, 4400mAh @ 14.8 volts, I do not know the total time it will last for but I used it for 6+ hours and it was still going strong, my Air is a i7 with the bigger processor, the battery is small and light making it convenient and easy to carry in your laptop bag or backpack.

My total cost including the charger is less than $80, the battery was $28 so after the cost of the mag safe connector and charger I can add more battery packs for $28 each or spend more on a larger capacity one.

Battery = $27.99 I chose this battery because it fits in a small side pocket in my laptop bag and is not big and heavy. It is 4400 mAh at 14.8 volts or about 65 watts, I think the standard 2011 Macbook airs battery is around 50 watts???? After 6 hours my air was still going off this battery with the screen brightness high and I ripped several dvd’s with handbrake, there was no ‘light’ use during this time.

Hobby King has a tool for selecting batteries, you choose your type, LifePO4 is what I ordered and select your voltage (14.8 volts) and they list batteries by mAh...

Charger = $24.95 - smart charger for 1-4 cell, if you buy a battery with more than 4 cells make sure you buy compatible charger for more cells.

I bought a used apple power adapter for $20 to remove the wire with the mag safe connector, I soldered 4mm radio shack quick connect bullet connectors on the end of the mag safe wire after I unsoldered it from the apple power adapter, the white wire is the positive wire.

This setup has been REALLY GOOD to me, for another $5 you can buy a car USB cigarette lighter 10w power adapter and connect it to this battery for an iPad or iPhone. I leave the battery in my laptop bag so all that comes out is the wire to plug into, it's a pretty slick setup that you can add more power anytime for not a lot of $.


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