I hear you...my story is exactly the same...
I bought it...4 years to the day it was dead and
I only had about 2K on my car (70 Coronet 2 door hard top)

Along the way, I had to constantly re-charge it
(from the car sitting to long and not driving it)...

The guy basically said... those old style acid
batteries only last 48 months under those circumstances...
True, I could have used one of those trickle charge devices etc...

It seems like for the money it should have lasted alot longer...
I loved the appearance but I got sick and tired of the poor performance.

Now I'm running an interstate... (it cost 1/3 of the AAB)
I hate the look...but I'm not forking over that much coin
for another one...

Seems like an awful lot of "reproduction" stuff in this hobby
works out like this:
It looks nice, promises a lot... delivers very little,
and costs a fortune...

Oh well... guess we signed up for it