When I had to replace the rx pack in my plane, I went to radical rc's website, and got a ni mh 1600 battery pack for 16 bucks, including soldered on connector, and shipping. Thats less than a 600 nicad from futaba. He uses all sanyo cells, so there shouldnt be a concern about quality. Nimh packs are also alot lighter and offer more power for the same physical sized nicads. I leave mine on the futaba wall wart charger when the plane is not in my truck, because the charge rate of the wall wart works out to right around trickle range. I have flown all day on a single charge, and still had plenty of power in reserve. I think I could go about 3-4 days on a charge, but I dont want to risk that. This is flying a fun-fly plane, standard servos, banging all 5 servos from endpoint to endpoint.

They are well worth the money.

Steve