We have a huge Escape Hybrid fleet. All the fans were taken out of our own 09 Ford Escape Hybrids and they will fit 05-09 ford escape hybrid.  All our vehicles have no cooling issues. That means both batteries and battery fans do not work hard and have lots of life left. 

Usually battery fan should last forever but if your cooling system is bad, your fan had to work much harder until broken.  You want to not only replace your fans but also check your cooling system and filters.