[Elecraft] K2: ext battery suggestions?

[J F]

I use sealed GelCells Doug...

These are the found in UPS units, usually in pairs.
The price is right I can get them for free when the
cells "fail". It seems that one battery will go well
before another.

I use them in tandem with the internal battery for
QRP. Picked up a Solar panel to keep a charge on them,
but haven't deployed it yet.

You could use motorcycle or mower batteries as well.
My preference is to stay away from anything that can
spill.

Cheers,
Julius
n2wn