Your thread is titled "Electronic ignition" but the problem seems to be battery/starter.. I think you need a new starter.. A good shop can determine that very swiftly but I've had problems with older cars over the years I will list them
I had a Ford that would act much as you describe, If you stopped it and then shortly after tried to re-start NO JOY, took a jump.. This one turned out to be a grounding issue on teh alternatorl I put a star washer under one of the mounting screws and no more problem. but that does not sound like your problem
Another ford the fan belt was slipping due to having the wrong belt, If I drove with headlights on the battery ran down But again this does not sound like your issue.
On a chevy if the starter got GUNKED UP, it acte4 exactly like yours, also very hard to start, even with a jump battery.. Replacing the starter fixed that.
Also had to do some engine work (Seals that were leaking oil onto the starter).