More Radar Questions

Q1: I have been looking at low-cost radar.  From talking to people around the club, there seem to be a lot of used ones on the market.  One person said "they're great radars!  They show you all kinds of things that aren't even there!", and apparently don't show you what *is* there.  It seems that all radars work well in flat seas but when things get rough then that's what separates the good from the bad.  Those who owned cheap radar are unloading them fast. 

Can anyone who has used radar in tall waves make a recommendation?

Q2: I have only one battery, and don't motor enough to charge it that way.  I charge it once or twice during the season and that's it.  Radar must draw quite a bit.  For those of you who have radar, what do you recommend?

thanks!