When you car is turned off your battery doesn't have the alternator pushing that constant stream of voltage to your battery to keep it charged. So your looking at a decrease in voltage by 2 - 3 volts while car is off. No part will fix this just simply start your car before you turn on your head lights.
Sounds like a bad alternator. The alternator runs the accessories as well as the charging of the battery, whereas the battery is resposible for start up. If you had to charge your battery that also means that alternator wasn't doing it's job and needs to be replaced. Its not a big deal to swap it out.
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