Futaba 4ch receiver

[Guest]

I have a Futaba FP-R4F mode 2 receiver, I can not find out what size battery to use. it has 72.870/ type 72-5/ AM/ and Rx 54 on the back. Could someone tell me what size battery(4.8v, 7.4v) I should be using?

And is the larger man hour size better?

[Guest]

Standard airborne pack for receivers and servos is 4 AA size batteries.

[Guest]

Thank You!!!