I think Doug got the battery from Danny but for any others needing a pack for their 3 channel Futaba 3PM, 3PM-X, 3PK or 3PKS I have the highest capacity packs that will fit in the battery compartment.
These will power most peoples transmitters every weekend for 3 months or more before needing to be topped up.
I have quite a few so instead of the $29 plus shipping I can offer them for a short time at $25 each shipped if anyone is in need of pack.