According to several customers of the Nissan Leaf EV, their cars are experiencing issues, particularly with regards to diminished battery capacity, in hot weather.

All the complaints came from the state of Arizona and Texas in the U.S. where customers are reporting that their Leaf's range on one full charge has been reduced by at least 30 percent to as much as 50 percent. According to Nissan, the Leaf shouldn't lose 30 percent of its battery capacity until it is 7 years old.

Visiting the forum site, the owners are complaining about how their cars were losing battery “bars” (12 bars indicate a full charge) even after overnight charging.

Like with many other batteries, heat is the suspected culprit for the loss of capacity, particularly if the car was parked in direct sunlight. Mark Perry, Nissan's director for product planning was quoted by CBS5 as saying “Heat is definitely not a friend of batteries, but I'm talking severe 130, 140 degrees.”

In Celsius, 130-140 degrees F translates to 54-60 degrees.

The question is: If the Leaf was brought here -or any other electric car from other manufacturers, for that matter- how would our country's intense summer heat and plus the humidity affect the battery life?