I wrote a couple of days ago that I was having trouble charging my ipad from a 12-volt battery. I would hook it up but get a “Not Charging” message. After doing some reading, I checked my charger and it is a 5-watt iphone charger. The ipad is looking for 10 watts. It will charge with the 5-watt charger, just slowly, and it must be closed when charging or the screen will consume all the meager power coming in. I have confirmed this by trying it, and it does work, but I think I’ll get a 10-watt charger.