I just got over this same problem! Optima Yellow top batteries have to be charged with a deep cycle battery charger that's made for agm batteries. I ended up having to replace my battery and haven't had the problem since. I thought I had a draw or a short but it turned out to be a dead cell in the battery. These optimas are tricky batteries to deal with. You'll definitely want to get a charger. I recommend the Schumacher battery charger as its for multiple types of batteries and they're easy to operate
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