ST just a quick note on the Ryobi vs Rigid power tool.  I purchased the Rigid combo drill/impact drill and they came with the Li-ion batteries and are guaranteed for life.  Rigid will replace a crapped out battery, you just have to register the serial #s on their website.  I like Red Owl's set up and am ready to retire my Fishin Buddy II that ran on 3 C's for the better part of a week up in Quetico.  Lots of info here on this thread, it should qualify most readers with an EE degree.
Marc