I assume you are talking about the QRP 15W K2, Doug.
I've had excellent results with a 7 AH sealed 12V AGM battery. Mine is made
by Interstate, but there are many vendors with similar size and ratings.
Size is 6" x 3.75" x 2.5" and it weighs in at a little under 6 lbs. Will
run K2 on receive for over 24 hours and I can easily get a day (8 hours) of
operating from it on CW. Can also be easily charged with a 10W solar panel.
Think I paid about $22 for it a couple years ago.
Of course both smaller and larger batteries may be used depending upon if
you're carrying it and the length of your operating period. I also have a
2.9 AH PowerSonic that weighs 2.5 lbs that I sometimes use if I won't be out
long. Batteries Plus carries a good selection and they may have a store
near you.
73
... Craig AC0DS
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