Power outlet in the bed drained the battery?

Well I was at a car meet and used the power outlet in the bed to charge my friends Canon dslr battery yesterday. Then turned the truck off. Then started the truck and it worked fine and drove it for about 30 mins. Then chilled at a friends house for a few hours and started the truck and it wouldnt start. Gauges and radio worked but not starting. We jumped it and I drove 1 hour home, everything worked fine. Tried to start it again and it didnt start. Bought a new battery and it started up fine again.

So, what I am asking is, does the button in the dash to use the power outlet need to be turned off after using it or is it automatic shutoff or it doesnt matter?

 

It automatically shuts off every time you turn the key off. Sometimes batteries just crap out.

 

Battery is bad. Dealer should replace it.

 

My engine was running while I was charging the Canon battery, I'm just wondering why the battery would go bad, it's a 2011. And too late on the dealer changing it, I already gave the core to Wal-mart and got a new one, but thats no big deal.

 

I've seen car batteries die in that amount of time, especially if you live in a hot area and if the battery is subjected to higher than average loads.

 

Well I was in New Orleans for the car meet, it's the most south you can get so it was definately hot..we were outside for atleast 5+ hours plus driving around all day and I also jumped a buddy of mine's car too...you saying I should have let it had some sort of rest?