atikovi, welcome to the forum. Sorry for answering this a bit late for you.
In February 2012 Mitsubishi was still selling i-MiEVs with a 2011 build date, so you should be ok from a battery (and OBC) warranty perspective.
Note that Mitsubishi's battery warranty does NOT cover battery degradation, only an outright failure of one or more cells or internal battery circuitry failure (rare). If the car charges to 100% (all sixteen bars are showing) they won't replace the battery even if the car can only go 20 miles.
At 70,000 miles, without actually measuring the battery capacity, you'd be buying a pig in a poke. A crude reference point is to see what the fully-charged Range Remaining indication is ... would expect at least 50 miles.
Battery replacement is not a financially viable option at this point in history.
Which mode SE is it? Only the SE Premium has CHAdeMO dcfc and Nav.
Sorry, I won't venture a $$ guess.