Question

In Passage 2, one weakness of the Berkley study is that the researchers

Answer 1

The one weakness of the Berkeley study is that the researchers looked at battery performance beyond the end of life" threshold.

Which batteries are used in EV vehicles?

A lot of plug-in hybrids and also electric vehicles are known to be ones that often uses lithium-ion batteries.

Note that Energy storage systems, such as batteries, are said to be vital for all-electric vehicles and as such, The one weakness of the Berkeley study is that the researchers looked at battery performance beyond the end of life" threshold.

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With today’s electric vehicle (EV) batteries, “end of life”

is commonly defined as when the storage capacity drops

30 down to 70 to 80 percent of the original capacity. As capacity

fades, the vehicle’s range decreases. Berkeley researchers

decided to investigate the extent to which vehicles still meet

the needs of drivers beyond this common battery retirement

threshold.

35 The Berkeley scientists analyzed power capacity fade, or

the declining ability of the battery to deliver power, such as

when accelerating on a freeway onramp, as it ages. They

modeled the impact of power fade on a vehicle’s ability to

accelerate as well as to climb steep hills and complete other

drive cycles. They found that power fade for the chosen

vehicle [a Nissan Leaf] does not have a significant impact on

an EV’s performance, and that a battery’s retirement will be

driven by energy capacity fade rather than by power fade.

The researchers thus conclude that “range anxiety may be

45 an over-stated concern” since EVs can meet the daily travel

needs of more than 85 percent of U.S. drivers even after

losing 20 percent of their originally rated battery capacity.

They also conclude that batteries can “satisfy daily mobility

In Passage 2, one weakness of the Berkeley study is that the

researchers

focused on power fade instead of energy capacity fade.

looked at battery performance beyond the end of life" threshold.

used one type of electric vehicle to generalize about all electric vehicles.

relied only on U. S. drivers.