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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