I have replaced battery, car runs fine for a couple days then it will not start unless I use a jumper, Everything checks good, car runs great except for this problem

It's the old parasitic drain. Something in the car is draining the battery when the engine is shut off. There are a lot of articles and videos available online if you search something like "Parasitic battery drain."

Parasitic battery drain measured 20 ma. I am having the same problem as the above question (maintenance and repair) with my 1993 Buick Roadmaster Limited. could this be a voltage regulator problem and or a shorted diode in the alternator

Your husband is turning on the interior lights (accidentally). After your cars are driven just turn headlights and interior lights all OFF. Easy fix!

Yes ,what a relief to find this same thing!!!! battery and alternater and voltage issue same as you wrote about but in a 1992 Limited editioni Amazing car i also love (gets worse in winter so may need to sell it) IF can't fix this ..happened after 2 local shops ,that were not familiar with older cars did 2 things; rewiring for windows to correctly go down and then MISTAKE took to a firestone who put a battery that is way way too low/small-like for a 1.8 liter engine of today- was told most repair and dealers and batteries made 2018 are not correct type these big Buiks need ...need a special kind of battery? a cold crank and higher number something like that....passed inspection 5months ago w/2yr tags all original marron and really just want to resolve this problem listed at op(so can keep as safe reliable car...if can keep this one from leaving me stranded on more than one occasion sorry such long response but additional questions *1) if anyones knows about the battery type and *2) I wonder if similar history of 92 93 and 94 Buicks -IS this just possibly w/make/model specific to what they end up all end up doing as pattern??????anyone else w similar history ------ responses welcomed,feel free to ctc using my work email elisaf1994@gmail.com thanks