Putting solar panels on your roof is probably a good investment, no matter where you live. But adding a home battery may do more harm than good.

A new solvent may mean fewer lithium-ion batteries left over from phones, electric vehicles, and other electronic devices will end up in landfills.

Knowing how long a battery will work could help new batteries come to market faster.

Electric cars are greener than the alternative, but battery recycling still produces a lot of emissions. Better tech and policy could change that.

A layer of red phosphorus in lithium metal batteries would send a signal to "shut it down" before lithium dendrites caused trouble.

"These polymers are very promising for batteries because they can charge and discharge way faster than any common battery in a phone or similar device."

The damage-resistant "structural battery" can stand up to hard impact and even stabbing without losing power.

"One of the ways to slow dendrites in lithium-ion batteries is to limit how fast they charge. People don't like that."