You need 6S not 3S packs for the 500. You can probaly run two of the 2200mah 3S in series though. I prefer running 3000mah ones myself for the longer flight times and the added weight doesn't bother me yet as I'm not doing hard 3D.

The 500 uses mini servos like the 9650 or 9257.

There is a static problem but there are grounding kits available that fix it.

It's a good mid size heli that's very stable and quite agile.