Best accessory purchase so far - Duracell Instant Charger

If you have the laptop why not just charge off the laptop directly? Maxwell's 2nd law would suggest it must be less efficient to charge from laptop->charger->kfire.
 
If you have the laptop why not just charge off the laptop directly? Maxwell's 2nd law would suggest it must be less efficient to charge from laptop->charger->kfire.
Sorry, I meant the battery is easy to charge if you're at home.
 

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