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depending on the laptop you can actually get larger batteries for them extending the running time. You could also lower the brightness of the screen (should be one of the function buttons) this means it will draw less power. You can also go into your laptop bios and most laptops will let you run the CPU at a reduced speed conserving battery life even further. Charging it during the day however is something you may need to look into. Maybe solar 12v battery to 240v converter. Not really sure.
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