Lipo help please

Thanks for any help on this matter,
about a year in a half ago i purchased 2 new Nue energy 5s4900 lipos for my brushless crt project ..they had been charged only once or twice then stored in an ammo box for about a year now as i moved and had been working out of state for a little over a year now ....now i want to resurrect my project and was wondering if there is any chance i can safely revive and charge the batterys or have i already ruined them ??(and not too mention wasted a couple hundred dollars) thank you so much for any help or advice