Troy, just out of interest a mate of mine did a rally down here over the weekend (in an R30 skyline!), he borrowed my rad cam and also savman's.
Mine lasted all day on the one battery (and only used about half power), plus didn't give any problems whatsoever.
Yet savman's battery didn't last even half as long, unit played up etc etc
Dar I say there might be an issue with some units??