Thanks for the info.  Interesting that they use 12 cells in series/parallel to 
get 4.5 Ah rather than just 4 larger cells.  I think I might go with 4 ea 32650 
or 32700 cells at 6-7 Ah....maybe these:
 https://www.amazon.com/dp/B08T632Z1Z/

...attended to with proper care and feeding, of course.  I'm looking at rigging 
up some sort of charger setup for them as well.  

Lou W7HV


   On Friday, January 29, 2021, 9:20:05 PM MST, Bryan Nehl <[email protected]> 
wrote:  
 
  Let me just put this out there:
Custom LiFePO4 18650 Battery: 12.8V 4500 mAh ( 57.6Wh, 7A rate ) w PCB and 
connector (batteryspace.com)
There is a wiring option to select for the K2 as well.
72 de Bryan, k0emt


    On Friday, January 29, 2021, 04:36:47 PM EST, Louandzip via Elecraft 
<[email protected]> wrote:  
 
  That's a good point.  My knee-jerk response is to go with rechargeable rather 
than (horrors!) disposables.  Way back, I did a fair amount of portable ops, so 
rechargeable made sense.  Now, IDK.  I'm just getting back into to it. For me, 
figuring this stuff out, deciding on an optimal solution, rigging it up, and 
making it work, is more fun than actually using it. HI HI.
Lou W7HV





    On Friday, January 29, 2021, 11:00:25 AM MST, Douglas Hagerman via Elecraft 
<[email protected]> wrote:  
 
 I'm thinking 4 individual LiFePO4 cells in the K2, maybe 4 ea 32700 @ 6 Ah and 
1.3 lb,? LiFePO4 being less fraught than LiIon.? 
Lou W7HV

—

Have you considered non-rechargeable AA Lithium batteries? Expensive, but they 
are available in every grocery store, last forever when not used, don’t leak 
(hopefully). Good for occasional field use, maybe?

Doug, W0UHU. 
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