Mark when I am camping I use a 80 litre Angel fridge LED tv and I run my laptop from the same battery using a 12v step up that any retailer like Harvey Norman and the like will sell you there are lots to choose. during the day I charge the battery with a solar cell. I started with a 80 watt cell but now use a fold out 3 panel 150 watt cell.
Phil
Edit - the internal battery charges fine with this setup
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