RE: Charging Batteries in the Field
When you drop by the field I fly at... you can look at the parking lot and tell what cars the electric plane pilots are flying... because their hoods will be up... charging batteries.
You can also invest in a marine quality lead battery (beefy car battery)... that way you don't risk draining your car battery and leaving yourself stranded. Plus... if you charge with a separate battery you can move it away from your car.. less risk of a catastrophic fire should you charge an ornery LiPo.