If the Nissan system is HSD (like the current (3rd) gen Prius), then a fully charged battery is a no-no...unless you like a shorter battery life. Also a fully depleted battery is bad...that's where the computer(s) come in to save our butts and NOT do the full charge/discharge. It keeps the charge between 40-80% in the Prius HSD. I suspect the Nissan is the similar. Finally a smart car that knows better than us humans!

'04 Seaside Pearl #7. Fumoto oil drain, mudflaps, rear bumper scuff protector & rear warn system, compass mirror, EV mode button, 8" subwoofer in right rear cubby & 6" subs under seats, power lumbar in the front seats, Coastaletech hitch w/ Aspen bike/snowboard rack. iPod2car, 2 amps, Alpine component speakers, and DVD video, solid 47 MPG @ 70000 miles.