Originally Posted by Jerm13

The chances of you draining the battery from using it as a power source for your chargers is pretty slim. There is a possibility but I doubt it will happen. That is, of coarse, you have a battery that is in decent shape and your charging system in the car/truck is fully functional.

Its all I do in the summer when running 1/8 scale. Charger is plugged in at about 8am and disconnected at the end of the day, usually around 6pm. That's charging 5-6 2 cell Lipo's, 4 lipo RX packs, and a gel cell for my starter boxes. Have yet to need a jump.

But if you are that worried about it, you can pick up a jumper box for about $100 or less. That would be cheap insurance
Or you could fire the vehicle up for about 15 minutes 1 or 2 times during the day to put some juice back in it.