Larry,
I just looked at your other post and I think this is a Lipo pack. If it is read on. If not ignore what I am saying!
On your FMA charger, are you setup to charge "1C Lipo"? It comes from the factory as a default setup for A123, which is a lower voltage per cell. If it is set for A123 and you have a lipo, then you aren't charging it to full capacity.
Again, if I am right, you can change the mode of charging by powering on the FMA chargqe without a battery. Now push AND HOLD the mode button on the right top side of the charger. It will cycle through a lot of options, one of which is 1C Lipo. When that one pops up, release the button, and that will select that charge mode. Now hook up the battery and charge it. When you plug the battery in, it should beep 4 times(I think) to tell you is is a 4s battery.