I'm a little concerned here!

I have heard in the past that NiCads should not be hooked up in parallel because of their low internal resistance. If one cell is at a lower voltage than one in the other pack the higher voltage will try to drive the low voltage pack like a resister, causing a thermal runaway in both packs. All of the set ups in this post so far have set up this condition.

Any battery experts out there have some input?