2.6oz / 73g is a bit over kill weight wise however 1,300mah is for sure over kill.
you only need 500 -700 tops for 4 servos suitable for a .15 size plane. Should yield
at least 5 flights with plenty of power to spare.

As a example I have used 460 mah (charged) for a .010 size plane getting 5 flights per session
was enough flying for me and left 210 mah in the pack.