<br><font size=2 face="sans-serif">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. </font>
<br>
<br><font size=2 face="sans-serif"> 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?</font>
<br>
<br><font size=2 face="sans-serif">--Lance</font>
<br>