00,neon intermittant dead battery

[blackshiep]

car has gone through 3 batteries in 5 months,intermittant "dead battery",target charging and actual charging 14.2 v,30% duty,monitoring 12v sense at pcm with lab scope gives an odd square wave,almost as if there is a broken winding in the alt.(tests good)
parasitic draw 10ma,no aftermarket of any kind,not a "short trip" driver.
can go 3/4 weekes between dead baterry episodes,when checked ,batteries have at least one dead cell,also noted battery acid on top of battery.
ok all you guru`s,,your best opinion,thanks!