Shares of electric vehicle (EV) battery start-up Solid Power (SLDP 3.67%) were moving higher on Thursday after rival QuantumScape (QS -4.03%) announced a new deal with Volkswagen (VWAGY -2.03%).

As of 11 a.m. ET today, Solid Power's shares were up about 13.5% from Wednesday's closing price.

Solid Power's stock is moving on a rival's big news

Colorado-based Solid Power is working to develop better EV batteries. The company's investors include automakers Ford Motor Company (F -4.11%) and BMW (BMW -2.09%). It also has a manufacturing partnership with Korean battery maker SK Innovation, which supplies several major automakers, including Ford, with EV batteries.

NASDAQ: SLDP

Solid Power
Today's Change
(3.67%) $0.03
Current Price
$0.96
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SLDP

Key Data Points

Market Cap
$169M
Day's Range
$0.95 - $0.99
52wk Range
$0.68 - $2.70
Volume
1,903,210
Avg Vol
2,556,444
Gross Margin
-12.48%
Dividend Yield
N/A

Solid Power itself didn't make news on Thursday. But its stock tends to move in tandem with that of another EV battery start-up, QuantumScape. Like Solid Power, QuantumScape is working to commercialize so-called solid-state batteries, which promise to make future EVs safer, lighter, and quicker to recharge.

Volkswagen is a key investor in QuantumScape, which -- like Solid Power -- is still finalizing development of its solid-state battery design. Under the deal announced on Thursday, VW's battery company, PowerCo, now has the right to produce up to 80 gigawatt-hours of QuantumScape-designed batteries per year under license. That's enough to power about 1 million EVs.

A battery charge level indicator.

Image source: Getty Images.

What QuantumScape's deal really means for Solid Power

For QuantumScape, the new deal is a vote of confidence from Volkswagen and an important step toward mass production, although the companies didn't share a timeline.

For Solid Power, the deal doesn't mean much by itself. But it reminded investors that solid-state battery technology is now closer to moving out of the laboratories and into EVs that consumers can buy.