To have more autonomy and less reliance on plug, You can buy one external battery, Although at the moment they are still quite expensive and I would expect that lower price and output of USB 3.1 they say that you will be able to charge devices such as netbooks via USB port 3.1 other device and if you are going by car and are always hands you can take advantage of the car battery and do a workaround with a 12V to 5V converter or using the cigarette lighter outlet to connect a USB adapter.
Kuwa na uhuru zaidi na chini wanaotegemea kuziba, Unaweza kununua moja betri nje, Ingawa kwa sasa ni bado kabisa ghali na bila kutarajia kwamba chini bei na pato la USB 3.1 wanasema kwamba utaweza malipo vifaa kama vile netbooks kupitia bandari USB 3.1 kifaa kingine na kama wewe ni kwenda kwa gari na huwa mikono unaweza kuchukua faida ya betri ya gari na kufanya workaround na betri ya 12 volti 5V kigeuzi au kutumia plagi kiwashio kuunganisha adapta ya USB.