I'm pretty sure the align esp would need a mod done in order to take a 3300mah battery. However before you do. Track down user Mhills in the large heli forum. He will know for a fact.
Here is a link showing how the mod is done. Its very simple, the only tool you need is a dremil with a cutting disk. http://www.mycoolheli.com/500mods/TrayMod/index.html
I had an hk500, And just running a 3000mah battery the mod was necessary. Nice thing about running a 3300mah battery is you get an extra min. of flight time.