I would like to borrow/buy an external battery for MacBookAir.
I am going to take 6 hours exam next month, where I can use a laptop for computation.
I'm not sure whether my MBA works so that long time without external battery.
I can pay at most $100 for purchase, or $30 for borrowing (one time use!)
I will use it on May 31st.
Please do not message this poster about other commercial services.
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