Internal battery options for K1 & K2

[Elecraft mailing list]

Fun fact:
The  K2's stock  SLA  2.9 Ah battery is:   7.0 x 2.36 x 1.38" = 22.8 cubic inches.   2.3 lb
A KX2 with its internal 2.6 Ah battery is:  5.8 x 2.80 x 1.50" = 24.4 cubic inches.  < 1lb

Without the  knobs and some shoehorning, you could just about fit a KX2 with its 2.6 Ah battery in the space allotted for the 2.9 Ah SLA battery in a K2 and save well over a pound.

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
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[Elecraft mailing list]

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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[Elecraft mailing list]

 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 <[hidden email]> 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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[Bryan Nehl]

 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 <[hidden email]> 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 <[hidden email]> 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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[Elecraft mailing list]

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 <[hidden email]> 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 <[hidden email]> 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 <[hidden email]> 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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