Hi Greg,
This should help. This is the exact receiver pack I use. You'll just need to remove the deans connector:
http://www.hobbypartz.com/a1syrx62slil1.html
FYI: Any A123 pack you get MUST have the balance connector otherwise you will not be able to charge it above the 1c rate. You'll just need to make sure you charger is capable of charging LiFe packs. I use the Xtrema Charger which has up to an 8 amp charge & will charge up to 4 batteries at once.
http://www.tmenet.com/products/lithi...xtrema-charger
http://www.youtube.com/watch?v=Iv6dD67SUew
The great thing about the A123 packs is that they can be charged up to 1000 times before ever needing to be replaced whereas LiPos are good for about 300 charges.
Saul