I guess I'm among the 'lucky' ones? My L3400 went out @ 3 years, <100 hours. I replaced it with an Interstate of the same size as the original though.
Like Bluegill2 said, your battery has to be fairly new; a prorated exchange should be in order.
I have the smaller L2800HST, but it is coming up on 7 years on the original battery.
Same here , mines a L3400 DT 2007 W/original battery.