[Elecraft] Internal Impedance of Li-Ion Battery Packs

[Ignacy]

I use 13V 20AH LiFePO3 for IC 7000. Very low internal resistance and good
enough for a few hours of operating at a 100W power level. But the weight is
7 lb. 

Li-Ion can be two times lighter than LiFePO3. 

I use 4S1P Li-Ion for KX3. About 2.4 AH and max voltage 16.8V.  Weight 6 oz.
I use it in two ways:

1. Charge to 16.8V and use with two diodes in series. 
2. Charge via one diode in series to 16.2V and attach to KX3 directly. About
15.3V max shown by KX3 as it has another diode internally. 

The pack has about 0.8V drop at 2.5 A. It is good for a few outings. 

There are low and high current Li-Ion packs. See
http://www.batteryspace.com/4cellspack148v.aspx.

I am considering adding 10A Li-Ion to IC7000 for short outings. The battery
should weight < 2 Lb. 

Ignacy



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