[Elecraft] Power Supply for K3 for Contest DXpeditions

[José Nunes CT1BOH]

Now that I have two K3's on my desktop, waiting for next CQWW Contest, I was
wondering if someone could advice on the Power Supply  that is RELIABLE
enough to take the heavy duty 48 hours SO2R non stop contesting CW and at
the same time PORTABLE enough to take on the airplane to Madeira (CT3NT).

Thanks in advance for any insight.
73
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José Nunes