I don't have the luxury of always planning my next flight out. I do have the luxury of being able to knock-off early in the afternoon if the weather is good! As a result, my batteries and I don't always see eye-to-eye on their current charge state - I don't always have a full nights charge on them when I'm able to fly. What is a good, simple charger that I can hook up to my field box's 12V 7A Gel Battery? How long will I need to quick charge before I'm able to fly? Don't need lots of bells and whistles, just ability to charge Tx and Rx some with NiCd and others with NiMH batts.