12 volt battery low same with traction battery

So I know my 12 volt is fully charged. I put it on a 12 volt battery charger. It was at 100%, I let it sit for a day. I tired to start it, the display said now 12 volt. I jumped it and started it just fine. But the traction battery was at 100% two days prior. How did both batteris get drained? I just put the 12 volt battery on the charger again. And the traction battery is fully charged. I drove it on charge mode for 10 minutes. The traction battery went from 66% to 96% in 10 minutes on charge mode. What is going on? TIA