Which of these batteries would you prefer to power a speed 400 plane (T-52 to be exact)?

You'd have to go with the NiCd between those two. The Radio Shack AA-sized NiMH cells (1400-1600 capacity) are marginal for speed 400 use - meaning anything smaller would be, well, too small. I don't know which 800's you have in mind, but they are probably too small for speed 400 use.
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Originally posted by hoppy:
I have two Speed 400 planes and fly both with 1420 mahr RS batteries. Both fly well and will stay up for over 18min at partial throttle. The NiMH is my favorite because of the long flight times. One is a Wingo and the other is a FMA Razor. The flying is relaxed....I don't know what they would do in a T-52....surely someone has tried it.
Hoppy

Is this an RS pack, or did you solder up the individual cells - could you please post the RS part#?

Thanks