[Elecraft] [KX1] A LiFePO4 internal battery option

[Ignacy]

 have lower energy density than regular Li-Ion rechargeables but due to lower
voltage one can use 4 of them for about 14 V max as opposed to 3 of the
regular ones with 12V max. For K1 the 3 Li-Ion would be a better fit as
10-12V is sufficient and weight is half of  LiFePO3. The last one are better
IMHO when the minimum voltage is >11V, e.g., for regular HF radios including
K3. 

I have the regular Li batteries in K2 for many years and never a problem
except higher Ah at 1/4 weight of lead acid.. The only trouble is a need for
connecting to an external charger. A simple choice is a small board that
attaches to a laptop charger and contains adjustable 1A regulator. 

Ignacy, NO9E 

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