The average lifespan of a car is 150,000 miles.

Your average driver drives 13,500 miles every year,

meaning a car lasts about 11 years.

Now, imagine you had a car that could last 400,000 miles.

800,000?

How about 1 million miles?

Your car could last an entire lifetime.

But a million-mile battery is the stuff of fiction...isn't it?

In April, Elon Musk announced Teslas would soon be powered

by a battery with a lifespan of more than 1 million miles.

The current battery pack is about

maybe 300,000 to 500,000 miles.

The new battery pack that'll probably go

into production next year is designed explicitly

for a million miles of operation.

In September, a team of battery researchers

at Dalhousie University, with support from Tesla,

published a paper that describes

a very special kind of battery —

a battery that it says "should be able to power

an electric vehicle for over 1 million miles."

Soon after, Tesla filed a patent for a battery

with a similar cell composition to the one in the paper.

Many of the Dalhousie researchers, including Jeff Dahn,

Xiaowei Ma, and Stephen Glazier, are listed as inventors.

So, is this the battery Musk needs?

The paper presents the results of years of testing

on a new battery cell formula, or chemistry.

And the team says the results from tests

on the battery are "far superior"

than other lithium-ion batteries.

So, what's so good about it?

Battery science is an exercise in experimentation.

The right tweak in the combination and efficiency

of the elements commonly used for batteries

could yield big results.

In addition to a winning combination,

the million-mile battery uses one large crystal

instead of many small crystals.

This single-crystal nanostructure is less likely

to develop cracks when the battery is charging.

Cracks cause a decrease in the lifetime

and performance of the battery.

How'd the new design do?

Well, the life of a battery is measured

in discharge cycles.

Using an amount equal to 100% of the battery's charge

is one cycle.

Where a typical lithium-ion battery could give you

only 1,000 to 2,000 discharge cycles,

tests showed the million-mile battery

had 95% of its life left after 1,000 discharge cycles

and about 90% after 4,000.

You're probably thinking:

"That's awesome!"

"We've got a great battery here."

And you're right.

This is an awesome battery.

But we're not going to see this version

of the battery in a Tesla.

There is one major thing Tesla would have to sort out

before it can use a battery like this in its cars.

This cell chemistry uses a large amount of cobalt.

Cobalt, a popular element in battery development,

carries inherent challenges.

One, cobalt is finite and running out.

So it's very expensive.

Two, mining cobalt is hazardous

and some cobalt mines have exploited children for labor.

Tesla is trying to eliminate cobalt

from its batteries entirely.

So, if we don't have a viable battery here,

what's the significance of the battery in the paper?

Well, it shows that we're close to obtaining a battery

that lasts a million miles

and is compatible for use in Teslas,

one that is cheaper and probably contains less cobalt.

A major announcement is on the horizon.

Specifically, we're waiting on Tesla's battery

and drivetrain investor day,

which has been pushed back to early 2020.

The paper and patent represent a big advancement

in battery tech and are undoubtedly a preface

to the actual million-mile battery composition

that will land itself in Teslas in the coming years.