Topic: battery range of EVs

[piersdad]

Concerns about plug-in vehicles becoming stranded by running out of battery power while traveling have been dubbed "range anxiety." It’s something like the anxious feeling of seeing your gas tank below E—and not being sure if you’re going to make it to the gas station.

Pure electric vehicles obviously do not have a gas tank, so their driving range is limited to the number of miles provided by the battery pack alone. The rule of thumb is that vehicle batteries provide approximately 4 miles of driving range for each "usable" kilowatt-hour of energy stored. So, look at the battery size of the plug-in vehicles listed on this site and multiply it times four.

But rules are made to be broken, and usually will be. Driving fast and cold weather conditions, for example, will reduce range. And the total amount of storage quoted by plug-in vehicle manufacturers doesn’t mean all those kilowatt-hours are usable. Auto manufacturers place extra battery capacity in the vehicle because the pack will last longer if it’s never fully charged or discharged.

vehical range

from experience never  use an EV past half range or the stress on the battery  will cost in the long run.
going dead flat in a lifepo4 battery can  kill one or more cells so the battery management system has to shut down altogether the battery so the user will be stranded. (been there done that)

The NEEV story