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My laptop has a feature that allows me to disable battery charging while plugged into an external power source. Disabling laptop battery charging cuts the laptop power usage in half. I don't want or need the external power source to charge the laptop battery, just to power the laptop, so I always turn this feature on when I'm in the field running off a set of external lead acid batteries. If I want the laptop battery charged, I'll charge it some other time/place. Does your laptop have a "disable battery charging" feature? And of course for the smallest power draw use a DC/DC converter to power the laptop rather than an AC adapter.
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