Battery Problems please help!!!!

I have a 71 scamp and its having battery problems. Ive replaced the battery and starter more than once. I also replaced the ultinater and voltage regulator. I have to put it on a charger every night so it will start in the morning. It turns over really slow and it doesn't start the first couple of times then the battery goes dead and i have to get a jump. I disconected the radio. the headlights dim when i hit the brakes running. running two things at once is imposible. Any suggestions wood be greatly appreciated. Thanks
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