I had an E-series that was probably pushing 10 years of life.
The screw on type brush heads instead of the push on smaller ones.
Someone got me a Sonicare (probably HX series, not very expensive I assume) which I started using and now that the E series was off the charger for so long it's dead and won't take a charge.
Doubtful the Sonicare will get as much life as old duke, but it's probably going on 2 years now and still going strong.
That E series was a tank compared to the newer smaller ones.
Does your live on the charger?
Do you know what failed on it?