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Gday Mark
You can also use a std DC-DC converter to step the deep cycle battery voltage up to suit the lappie if longer use is required than the std batteries will give.
One thing i found with my lappie is they specify it must have a 19V DC supply, but this is so it can charge the internal battery as well.
If i run my lappie off 15V or less, the lappie still runs happily, but the internal battery charger is isolated, and hence it becomes much more efficient.
Andrew
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