I bought one of the DC-DC converters on Ebay, cost around $40 inc. postage. Not used it in the field yet but does a good job of recharging the lappy while travelling. If you have one of the older Dells with the square 3 pin plug most of the converters don't seem to include one but this did. I needed one as I run 2 lappies for imaging and guiding.
Cheers
Bill
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