Battery Question

[s.vannostrand at kodak.com]

Since they are truly parallel systems, the capacities add.  With 3400 mah 
you could fly cross country.  Hopefully you are wired so you can test each 
battery separately.  If this is a pattern ship, you might consider 2 800 
mah packs.  I like the idea of parallel batterys if there is a concern 
about being able to source current fast enough, however I don't know if 
this is a problem with NiCds. 

 In EE terms, the source impedance is a way of expressing the ability of a 
battery to supply a spike of current.  I've heard that Li-ion and Nimh 
have much higher source impedances than NiCds.  Actually that Li-ion is 
the worst and NiCds are the best of the three.  However, what I don't know 
(and htere are people on both sides of this) is if any of these batterys 
have a souce impedance that is too high.  In other words, in a plane with 
6 digital servos potentially moving together at the same time, would any 
of these battery types be unable to supply the current needed to inhibit 
proper servo performance?

--Lance
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