I can happily confirm that the Airtronics 92824 receiver that comes with the RDS8000 is quite happy with a 4.8v 600Mah receiver battery. I've been flying my RDS8000 for about 18 months now, and I've experience nothing but happy flying using standard receiver packs on four different trainers and sport planes while using my 2.4Ghz radio system. I do hava a 6.0v NiMH pack on another plane, but it was more for improving servo performance than anything else.

In fact, I recently purchased a pair of new Hitec 4.8V 600Mah NiCd receiver packs from http://www.servocity.com for $5.00 each. Feel free to spend more if you wish.

Good luck and good shopping.