Lithium-ion batteries show up in electric cars, Segways, and even hearing aids. But not only can they catch fire, they use rare earth minerals and are toxic to the environment.

That's why it's good news that the Skolkovo Institute of Science and Technology in Moscow has developed a high-capacity, high-power battery that's made with potassium.

Yes, potassium — the mineral that helps power your muscles, too. 

Unfortunately, if you're like most people you're not getting enough of this heartbeat-regulating, fluid- balancing, muscle-contracting, nerve-signaling nutrient.

In fact, Americans are so potassium-deficient that the 2015-2020 Dietary Guidelines identifies it as "a nutrient of public health concern."

The average daily potassium intake (3,016 mg for men and 2,320 mg for women) is below what's called "adequate intake" (3,400 mg for men and 2,600 mg for women), and falls way short of what used to be the federal recommendation of 4,700 mg.

Deficiency matters. One eight-year study of men found that those who took in 4,300 mg of dietary potassium daily were 38% less likely to have a stroke than those who got just 2,400 mg daily.

A similar study followed women for 14 years and found an anti-stroke benefit — although not as significant as for men. 

Because too much potassium is also risky, never take a supplement without a doctor's recommendation, and rely on food for your daily supply.

Top sources include apricots, prunes, squash, baked potatoes, beans, brown rice, bananas, spinach, chicken and turkey breast, salmon, broccoli, and your morning cup of coffee.